aura: Destroy the compositor before destroying the backing window.

ui/views/win/hwnd_message_handler.cc

 // 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.
 
 #include "ui/views/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include "base/bind.h"
@@ skipping 904 matching lines @@
   // DefWindowProc() may have destroyed the window in a nested message loop.
   if (!::IsWindow(window))
     return result;
 
   if (delegate_)
     delegate_->PostHandleMSG(message, w_param, l_param);
   if (message == WM_NCDESTROY) {
 #if !defined(USE_AURA)
     base::MessageLoopForUI::current()->RemoveObserver(this);
 #endif
+    SetDestroyed();
     if (delegate_)
       delegate_->HandleDestroyed();
   }
 
   // Only top level widget should store/restore focus.
   if (message == WM_ACTIVATE && delegate_->CanSaveFocus())
     PostProcessActivateMessage(LOWORD(w_param), !!HIWORD(w_param));
 
   if (message == WM_ENABLE && restore_focus_when_enabled_) {
     // This path should be executed only for top level as
@@ skipping 1320 matching lines @@
   SetMsgHandled(FALSE);
 }
 
 void HWNDMessageHandler::HandleTouchEvents(const TouchEvents& touch_events) {
   base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
   for (size_t i = 0; i < touch_events.size() && ref; ++i)
     delegate_->HandleTouchEvent(touch_events[i]);
 }
 
 }  // namespace views