Ignore fullscreen windows which are behind other windows for fullscreen mode.

chrome/browser/notifications/fullscreen_notification_blocker.cc

 // 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.
 
 #include "chrome/browser/notifications/fullscreen_notification_blocker.h"
 
 #include "base/time/time.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/fullscreen.h"
 #include "content/public/browser/notification_service.h"
@@ skipping 15 matching lines @@
     ash::internal::RootWindowController* controller =
         ash::internal::RootWindowController::ForTargetRootWindow();
 
     // During shutdown |controller| can be NULL.
     if (!controller)
       return false;
 
     // Block notifications if the shelf is hidden because of a fullscreen
     // window.
     const aura::Window* fullscreen_window =
-        controller->GetTopmostFullscreenWindow();
+        controller->GetWindowForFullscreenMode();
     if (!fullscreen_window)
       return false;
     return ash::wm::GetWindowState(fullscreen_window)->
         hide_shelf_when_fullscreen();
   }
 #endif
 
   return IsFullScreenMode();
 }
 
@@ skipping 31 matching lines @@
   return enabled;
 }
 
 void FullscreenNotificationBlocker::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_FULLSCREEN_CHANGED, type);
   CheckState();
 }