Always restart the hung page timer after a beforeunload dialog.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 445 matching lines @@
   // Deletes the current selection plus the specified number of characters
   // before and after the selection or caret.
   void ExtendSelectionAndDelete(size_t before, size_t after);
 
   // Deletes text before and after the current cursor position, excluding the
   // selection.
   void DeleteSurroundingText(size_t before, size_t after);
 
   // Notifies the RenderFrame that the JavaScript message that was shown was
   // closed by the user.
-  void JavaScriptDialogClosed(IPC::Message* reply_msg,
+  void JavaScriptDialogClosed(bool is_before_unload_dialog,

[Charlie Reis, 2017/02/27 18:41:41]

nit: I'd suggest putting this down near dialog_was_suppressed, since it's more
about the context in which the call was made than the primary arguments
(reply_msg, success, user_input).

[Avi (use Gerrit), 2017/02/27 19:28:49]

Done.

+                              IPC::Message* reply_msg,
                               bool success,
                               const base::string16& user_input,
                               bool dialog_was_suppressed);
 
   // Get the accessibility mode from the delegate and Send a message to the
   // renderer process to change the accessibility mode.
   void UpdateAccessibilityMode();
 
   // Samsung Galaxy Note-specific "smart clip" stylus text getter.
   void RequestSmartClipExtract(SmartClipCallback callback, gfx::Rect rect);
@@ skipping 674 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_