Mac Chromium style checker cleanup

chrome/browser/ui/cocoa/info_bubble_window.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_nsobject.h"
 #include "chrome/common/chrome_notification_types.h"
@@ skipping 20 matching lines @@
 
 // A helper class to proxy app notifications to the window.
 class AppNotificationBridge : public content::NotificationObserver {
  public:
   explicit AppNotificationBridge(InfoBubbleWindow* owner) : owner_(owner) {
     registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
                    content::NotificationService::AllSources());
   }
 
   // Overridden from content::NotificationObserver.
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) {
+  virtual void Observe(
+      int type,
+      const content::NotificationSource& source,
+      const content::NotificationDetails& details) OVERRIDE {
     switch (type) {
       case chrome::NOTIFICATION_APP_TERMINATING:
         [owner_ appIsTerminating];
         break;
       default:
         NOTREACHED() << L"Unexpected notification";
     }
   }
 
  private:
@@ skipping 167 matching lines @@
 - (void)sendEvent:(NSEvent*)theEvent {
   if (!closing_)
     [super sendEvent:theEvent];
 }
 
 - (BOOL)isClosing {
   return closing_;
 }
 
 @end