diff --git a/atom/browser/api/atom_api_web_contents_view.cc b/atom/browser/api/atom_api_web_contents_view.cc
index f0f45da98a89..82468929db6c 100644
--- a/atom/browser/api/atom_api_web_contents_view.cc
+++ b/atom/browser/api/atom_api_web_contents_view.cc
@@ -36,8 +36,6 @@ class WebContentsViewRelay
 
 }  // namespace
 
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(WebContentsViewRelay);
-
 namespace atom {
 
 namespace api {
diff --git a/atom/browser/web_contents_permission_helper.cc b/atom/browser/web_contents_permission_helper.cc
index b9533e481bbb..ebea4eba82a5 100644
--- a/atom/browser/web_contents_permission_helper.cc
+++ b/atom/browser/web_contents_permission_helper.cc
@@ -14,8 +14,6 @@
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/render_process_host.h"
 
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(atom::WebContentsPermissionHelper);
-
 namespace {
 
 std::string MediaStreamTypeToString(content::MediaStreamType type) {
diff --git a/atom/browser/web_contents_preferences.cc b/atom/browser/web_contents_preferences.cc
index fd0112d6b7b6..405cdabba9b1 100644
--- a/atom/browser/web_contents_preferences.cc
+++ b/atom/browser/web_contents_preferences.cc
@@ -30,8 +30,6 @@
 #include "ui/gfx/switches.h"
 #endif
 
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(atom::WebContentsPreferences);
-
 namespace {
 
 bool GetAsString(const base::Value* val,
diff --git a/atom/browser/web_contents_zoom_controller.cc b/atom/browser/web_contents_zoom_controller.cc
index 35b8e4635cff..a809544984ef 100644
--- a/atom/browser/web_contents_zoom_controller.cc
+++ b/atom/browser/web_contents_zoom_controller.cc
@@ -15,8 +15,6 @@
 #include "content/public/common/page_zoom.h"
 #include "net/base/url_util.h"
 
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(atom::WebContentsZoomController);
-
 namespace atom {
 
 WebContentsZoomController::WebContentsZoomController(