diff --git a/atom/browser/api/atom_api_web_contents.cc b/atom/browser/api/atom_api_web_contents.cc
index 9390777f9c58..b9692c228e84 100644
--- a/atom/browser/api/atom_api_web_contents.cc
+++ b/atom/browser/api/atom_api_web_contents.cc
@@ -13,6 +13,7 @@
 #include "atom/browser/atom_browser_client.h"
 #include "atom/browser/atom_browser_context.h"
 #include "atom/browser/atom_browser_main_parts.h"
+#include "atom/browser/child_web_contents_tracker.h"
 #include "atom/browser/lib/bluetooth_chooser.h"
 #include "atom/browser/native_window.h"
 #include "atom/browser/net/atom_network_delegate.h"
@@ -466,6 +467,7 @@ void WebContents::AddNewContents(content::WebContents* source,
                                  const gfx::Rect& initial_rect,
                                  bool user_gesture,
                                  bool* was_blocked) {
+  new ChildWebContentsTracker(new_contents);
   v8::Locker locker(isolate());
   v8::HandleScope handle_scope(isolate());
   auto api_web_contents = CreateFrom(isolate(), new_contents);
diff --git a/atom/browser/api/atom_api_window.cc b/atom/browser/api/atom_api_window.cc
index 2a77a46a3ae4..6748c9c0dd1d 100644
--- a/atom/browser/api/atom_api_window.cc
+++ b/atom/browser/api/atom_api_window.cc
@@ -9,7 +9,6 @@
 #include "atom/browser/api/atom_api_web_contents.h"
 #include "atom/browser/browser.h"
 #include "atom/browser/native_window.h"
-#include "atom/browser/root_web_contents_tracker.h"
 #include "atom/common/native_mate_converters/callback.h"
 #include "atom/common/native_mate_converters/file_path_converter.h"
 #include "atom/common/native_mate_converters/gfx_converter.h"
@@ -101,7 +100,6 @@ Window::Window(v8::Isolate* isolate, v8::Local<v8::Object> wrapper,
 
     // Creates the WebContents used by BrowserWindow.
     web_contents = WebContents::Create(isolate, web_preferences);
-    new RootWebContentsTracker(web_contents.get()->web_contents());
   }
 
   Init(isolate, wrapper, options, web_contents);
diff --git a/atom/browser/atom_browser_client.cc b/atom/browser/atom_browser_client.cc
index 0a480dcd80aa..a2498cb346bb 100644
--- a/atom/browser/atom_browser_client.cc
+++ b/atom/browser/atom_browser_client.cc
@@ -15,8 +15,8 @@
 #include "atom/browser/atom_quota_permission_context.h"
 #include "atom/browser/atom_resource_dispatcher_host_delegate.h"
 #include "atom/browser/atom_speech_recognition_manager_delegate.h"
+#include "atom/browser/child_web_contents_tracker.h"
 #include "atom/browser/native_window.h"
-#include "atom/browser/root_web_contents_tracker.h"
 #include "atom/browser/web_contents_permission_helper.h"
 #include "atom/browser/web_contents_preferences.h"
 #include "atom/browser/window_list.h"
@@ -105,7 +105,7 @@ bool AtomBrowserClient::ShouldCreateNewSiteInstance(
     }
     auto web_contents =
         content::WebContents::FromRenderFrameHost(render_frame_host);
-    if (RootWebContentsTracker::IsRootWebContents(web_contents)) {
+    if (!ChildWebContentsTracker::IsChildWebContents(web_contents)) {
       // Root WebContents should always create new process
       // to make sure native addons are loaded correctly after reload / navigation.
       // (Non-root WebContents opened by window.open() should try to reuse process
diff --git a/atom/browser/child_web_contents_tracker.cc b/atom/browser/child_web_contents_tracker.cc
new file mode 100644
index 000000000000..3058fe9906b4
--- /dev/null
+++ b/atom/browser/child_web_contents_tracker.cc
@@ -0,0 +1,28 @@
+#include "child_web_contents_tracker.h"
+#include <unordered_set>
+
+namespace atom {
+
+namespace {
+
+std::unordered_set<content::WebContents*> g_child_web_contents;
+
+}  // namespace
+
+ChildWebContentsTracker::ChildWebContentsTracker(
+    content::WebContents* web_contents)
+    : content::WebContentsObserver(web_contents) {
+  g_child_web_contents.insert(web_contents);
+}
+
+bool ChildWebContentsTracker::IsChildWebContents(
+    content::WebContents* web_contents) {
+  return g_child_web_contents.find(web_contents) != g_child_web_contents.end();
+}
+
+void ChildWebContentsTracker::WebContentsDestroyed() {
+  g_child_web_contents.erase(web_contents());
+  delete this;
+}
+
+}  // namespace atom
diff --git a/atom/browser/child_web_contents_tracker.h b/atom/browser/child_web_contents_tracker.h
new file mode 100644
index 000000000000..16eaa6424c35
--- /dev/null
+++ b/atom/browser/child_web_contents_tracker.h
@@ -0,0 +1,21 @@
+#ifndef ATOM_BROWSER_CHILD_WEB_CONTENTS_TRACKER_H_
+#define ATOM_BROWSER_CHILD_WEB_CONTENTS_TRACKER_H_
+
+#include "content/public/browser/web_contents_observer.h"
+
+namespace atom {
+
+// ChildWebContentsTracker tracks root WebContents created by
+// `new BrowserWindow`.
+class ChildWebContentsTracker : public content::WebContentsObserver {
+ public:
+  ChildWebContentsTracker(content::WebContents* web_contents);
+  static bool IsChildWebContents(content::WebContents* web_contents);
+
+ protected:
+  void WebContentsDestroyed() override;
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_CHILD_WEB_CONTENTS_TRACKER_H_
diff --git a/atom/browser/root_web_contents_tracker.cc b/atom/browser/root_web_contents_tracker.cc
deleted file mode 100644
index dfdc8a1ffbd8..000000000000
--- a/atom/browser/root_web_contents_tracker.cc
+++ /dev/null
@@ -1,28 +0,0 @@
-#include "root_web_contents_tracker.h"
-#include <unordered_set>
-
-namespace atom {
-
-namespace {
-
-std::unordered_set<content::WebContents*> g_root_web_contents;
-
-}  // namespace
-
-RootWebContentsTracker::RootWebContentsTracker(
-    content::WebContents* web_contents)
-    : content::WebContentsObserver(web_contents) {
-  g_root_web_contents.insert(web_contents);
-}
-
-bool RootWebContentsTracker::IsRootWebContents(
-    content::WebContents* web_contents) {
-  return g_root_web_contents.find(web_contents) != g_root_web_contents.end();
-}
-
-void RootWebContentsTracker::WebContentsDestroyed() {
-  g_root_web_contents.erase(web_contents());
-  delete this;
-}
-
-}  // namespace atom
diff --git a/atom/browser/root_web_contents_tracker.h b/atom/browser/root_web_contents_tracker.h
deleted file mode 100644
index 4a6ae0776d83..000000000000
--- a/atom/browser/root_web_contents_tracker.h
+++ /dev/null
@@ -1,21 +0,0 @@
-#ifndef ATOM_BROWSER_ROOT_WEB_CONTENTS_TRACKER_H_
-#define ATOM_BROWSER_ROOT_WEB_CONTENTS_TRACKER_H_
-
-#include "content/public/browser/web_contents_observer.h"
-
-namespace atom {
-
-// RootWebContentsTracker tracks root WebContents created by
-// `new BrowserWindow`.
-class RootWebContentsTracker : public content::WebContentsObserver {
- public:
-  RootWebContentsTracker(content::WebContents* web_contents);
-  static bool IsRootWebContents(content::WebContents* web_contents);
-
- protected:
-  void WebContentsDestroyed() override;
-};
-
-}  // namespace atom
-
-#endif  // ATOM_BROWSER_ROOT_WEB_CONTENTS_TRACKER_H_
diff --git a/filenames.gypi b/filenames.gypi
index a45662beafda..f872c2830f27 100644
--- a/filenames.gypi
+++ b/filenames.gypi
@@ -198,6 +198,8 @@
       'atom/browser/browser_mac.mm',
       'atom/browser/browser_win.cc',
       'atom/browser/browser_observer.h',
+      'atom/browser/child_web_contents_tracker.cc',
+      'atom/browser/child_web_contents_tracker.h',
       'atom/browser/common_web_contents_delegate_mac.mm',
       'atom/browser/common_web_contents_delegate_views.cc',
       'atom/browser/common_web_contents_delegate.cc',
@@ -273,8 +275,6 @@
       'atom/browser/relauncher.h',
       'atom/browser/render_process_preferences.cc',
       'atom/browser/render_process_preferences.h',
-      'atom/browser/root_web_contents_tracker.cc',
-      'atom/browser/root_web_contents_tracker.h',
       'atom/browser/ui/accelerator_util.cc',
       'atom/browser/ui/accelerator_util.h',
       'atom/browser/ui/accelerator_util_mac.mm',