Mac Chromium style checker cleanup

chrome/browser/ui/cocoa/extensions/extension_popup_controller.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/extensions/extension_popup_controller.h"
 
 #include <algorithm>
 
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/extensions/extension_host.h"
@@ skipping 65 matching lines @@
 
  private:
   ExtensionPopupController* controller_; // Weak; owns this.
 };
 
 class DevtoolsNotificationBridge : public content::NotificationObserver {
  public:
   explicit DevtoolsNotificationBridge(ExtensionPopupController* controller)
     : controller_(controller) {}
 
-  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_EXTENSION_HOST_DID_STOP_LOADING: {
         if (content::Details<extensions::ExtensionHost>(
                 [controller_ extensionHost]) == details) {
           [controller_ showDevTools];
         }
         break;
       }
       case content::NOTIFICATION_DEVTOOLS_AGENT_ATTACHED: {
         RenderViewHost* rvh = [controller_ extensionHost]->render_view_host();
@@ skipping 272 matching lines @@
   return minSize;
 }
 
 // Private (TestingAPI)
 + (NSSize)maxPopupSize {
   NSSize maxSize = {ExtensionViewMac::kMaxWidth, ExtensionViewMac::kMaxHeight};
   return maxSize;
 }
 
 @end