Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/views/widget/desktop_aura/x11_desktop_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/widget/desktop_aura/x11_desktop_handler.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 
 #include "base/message_loop/message_loop.h"
@@ skipping 164 matching lines @@
     case CreateNotify:
       OnWindowCreatedOrDestroyed(event->type, event->xcreatewindow.window);
       break;
     case DestroyNotify:
       OnWindowCreatedOrDestroyed(event->type, event->xdestroywindow.window);
       break;
     default:
       NOTREACHED();
   }
 
-  return ui::POST_DISPATCH_NONE;
+  return ui::kPostDispatchNone;
 }
 
 void X11DesktopHandler::OnWindowInitialized(aura::Window* window) {
 }
 
 void X11DesktopHandler::OnWillDestroyEnv() {
   g_handler = NULL;
   delete this;
 }
 
@@ skipping 39 matching lines @@
     ui::XMenuList::GetInstance()->MaybeUnregisterMenu(window);
   }
 
   if (event_type == DestroyNotify) {
     // Notify the XForeignWindowManager that |window| has been destroyed.
     ui::XForeignWindowManager::GetInstance()->OnWindowDestroyed(window);
   }
 }
 
 }  // namespace views