base: Fix/add header #ifndef guards.

base/message_loop/message_pump_dispatcher.h

 // 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.
 
-#ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
-#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
+#ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H_
+#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H_
 
 #include <stdint.h>
 
 #include "base/base_export.h"
 #include "base/event_types.h"
 
 namespace base {
 
 // Dispatcher is used during a nested invocation of Run to dispatch events when
 // |RunLoop(dispatcher).Run()| is used.  If |RunLoop().Run()| is invoked,
@@ skipping 16 matching lines @@
   // Dispatches the event. The return value can have more than one
   // PostDispatchAction flags OR'ed together. If POST_DISPATCH_PERFORM_DEFAULT
   // is set in the returned value, then the message-pump performs the default
   // action. If POST_DISPATCH_QUIT_LOOP is set, in the return value, then the
   // nested loop exits immediately.
   virtual uint32_t Dispatch(const NativeEvent& event) = 0;
 };
 
 }  // namespace base
 
-#endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
+#endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H_