Fix cpplint errors

atom/browser/atom_browser_client.cc

@@ -106,10 +106,10 @@ bool AtomBrowserClient::ShouldCreateNewSiteInstance(
     auto web_contents =
         content::WebContents::FromRenderFrameHost(render_frame_host);
     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
-      //  to allow synchronous cross-window scripting.)
+      // 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 to allow synchronous cross-window scripting.)
       return true;
     }
   }

atom/browser/child_web_contents_tracker.cc

@@ -1,4 +1,9 @@
-#include "child_web_contents_tracker.h"
+// Copyright (c) 2017 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/child_web_contents_tracker.h"
+
 #include <unordered_set>
 
 namespace atom {

atom/browser/child_web_contents_tracker.h

@@ -1,3 +1,7 @@
+// Copyright (c) 2017 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
 #ifndef ATOM_BROWSER_CHILD_WEB_CONTENTS_TRACKER_H_
 #define ATOM_BROWSER_CHILD_WEB_CONTENTS_TRACKER_H_
 
@@ -9,7 +13,7 @@ namespace atom {
 // created by native `window.open()`
 class ChildWebContentsTracker : public content::WebContentsObserver {
  public:
-  ChildWebContentsTracker(content::WebContents* web_contents);
+  explicit ChildWebContentsTracker(content::WebContents* web_contents);
   static bool IsChildWebContents(content::WebContents* web_contents);
 
  protected: