Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/events/platform/platform_event_source.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_EVENTS_PLATFORM_PLATFORM_EVENT_SOURCE_H_
 #define UI_EVENTS_PLATFORM_PLATFORM_EVENT_SOURCE_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 24 matching lines @@
   // event.
   void AddPlatformEventDispatcher(PlatformEventDispatcher* dispatcher);
 
   // Removes a dispatcher from the dispatcher list. Dispatchers can safely be
   // removed from the dispatcher list during an event is being dispatched,
   // without affecting the dispatch of the event to other existing dispatchers.
   void RemovePlatformEventDispatcher(PlatformEventDispatcher* dispatcher);
 
   // Installs a PlatformEventDispatcher that receives all the events. The
   // dispatcher can process the event, or request that the default dispatchers
-  // be invoked by setting |POST_DISPATCH_PERFORM_DEFAULT| flag from the
+  // be invoked by setting |kPostDispatchPerformDefault| flag from the
   // |DispatchEvent()| override.
   // The returned |ScopedEventDispatcher| object is a handler for the overridden
   // dispatcher. When this handler is destroyed, it removes the overridden
   // dispatcher, and restores the previous override-dispatcher (or NULL if there
   // wasn't any).
   scoped_ptr<ScopedEventDispatcher> OverrideDispatcher(
       PlatformEventDispatcher* dispatcher);
 
   void AddPlatformEventObserver(PlatformEventObserver* observer);
   void RemovePlatformEventObserver(PlatformEventObserver* observer);
@@ skipping 37 matching lines @@
   bool overridden_dispatcher_restored_;
 
   ObserverList<PlatformEventObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformEventSource);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_PLATFORM_PLATFORM_EVENT_SOURCE_H_