Mac Chromium style checker cleanup

chrome/browser/ui/cocoa/extensions/browser_action_button.mm

Index: chrome/browser/ui/cocoa/extensions/browser_action_button.mm
diff --git a/chrome/browser/ui/cocoa/extensions/browser_action_button.mm b/chrome/browser/ui/cocoa/extensions/browser_action_button.mm
index 86e62aa57443c1d97192b884266f4dc45424b3e0..a9d9984998681a897384ccdf312bb5ade5b64660 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_action_button.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_action_button.mm
@@ -60,14 +60,15 @@ class ExtensionActionIconFactoryBridge
   virtual ~ExtensionActionIconFactoryBridge() {}
 
   // ExtensionActionIconFactory::Observer implementation.
-  void OnIconUpdated() OVERRIDE {
+  virtual void OnIconUpdated() OVERRIDE {
     [owner_ updateState];
   }
 
   // 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 {
     if (type == chrome::NOTIFICATION_EXTENSION_BROWSER_ACTION_UPDATED)
       [owner_ updateState];
     else