[Ozone-DRI] Assume window IPC arrives before surface IPC

ui/ozone/platform/dri/dri_window_delegate_manager.h

 // Copyright 2014 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 UI_OZONE_PLATFORM_DRI_DRI_WINDOW_DELEGATE_MANAGER_H_
 #define UI_OZONE_PLATFORM_DRI_DRI_WINDOW_DELEGATE_MANAGER_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ skipping 13 matching lines @@
 
   // Removes the delegate for |widget|. Note: |widget| must have a delegate
   // associated with it when calling this function.
   scoped_ptr<DriWindowDelegate> RemoveWindowDelegate(
       gfx::AcceleratedWidget widget);
 
   // Returns the delegate associated with |widget|. Note: This function should
   // be called only if a valid delegate has been associated with |widget|.
   DriWindowDelegate* GetWindowDelegate(gfx::AcceleratedWidget widget);
 
-  // Check if |widget| has a valid delegate associated with it.
-  bool HasWindowDelegate(gfx::AcceleratedWidget widget);
-
  private:
   typedef base::ScopedPtrHashMap<gfx::AcceleratedWidget, DriWindowDelegate>
       WidgetToDelegateMap;
 
   WidgetToDelegateMap delegate_map_;
 
   DISALLOW_COPY_AND_ASSIGN(DriWindowDelegateManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_DRI_WINDOW_DELEGATE_MANAGER_H_