Fix unresponsive tab closure when a navigation is in progress.

content/browser/renderer_host/render_view_host_impl.h

 // Copyright (c) 2012 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_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 203 matching lines @@
   // frame RenderFrameHost.
   bool is_active() const { return is_active_; }
   void set_is_active(bool is_active) { is_active_ = is_active; }
 
   // Tracks whether this RenderViewHost is swapped out, according to its main
   // frame RenderFrameHost.
   void set_is_swapped_out(bool is_swapped_out) {
     is_swapped_out_ = is_swapped_out;
   }
 
+  // TODO(creis): Remove as part of http://crbug.com/418265.
+  bool is_waiting_for_close_ack() const { return is_waiting_for_close_ack_; }
+
   // Tells the renderer that this RenderView will soon be swapped out, and thus
   // not to create any new modal dialogs until it happens.  This must be done
   // separately so that the PageGroupLoadDeferrers of any current dialogs are no
   // longer on the stack when we attempt to swap it out.
   void SuppressDialogsUntilSwapOut();
 
   // Close the page ignoring whether it has unload events registers.
   // This is called after the beforeunload and unload events have fired
   // and the user has agreed to continue with closing the page.
   void ClosePageIgnoringUnloadEvents();
@@ skipping 234 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_