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

ui/ozone/platform/dri/dri_window_delegate_manager.cc

 // 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.
 
 #include "ui/ozone/platform/dri/dri_window_delegate_manager.h"
 
 #include "ui/ozone/platform/dri/dri_window_delegate.h"
 
 namespace ui {
 
@@ skipping 23 matching lines @@
 DriWindowDelegate* DriWindowDelegateManager::GetWindowDelegate(
     gfx::AcceleratedWidget widget) {
   WidgetToDelegateMap::iterator it = delegate_map_.find(widget);
   if (it != delegate_map_.end())
     return it->second;
 
   NOTREACHED() << "Attempting to get non-existing delegate for " << widget;
   return NULL;
 }
 
-bool DriWindowDelegateManager::HasWindowDelegate(
-    gfx::AcceleratedWidget widget) {
-  return delegate_map_.find(widget) != delegate_map_.end();
-}
-
 }  // namespace ui