Remove obsolete TODO and add a bunch of OVERRIDEs.

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Review URL: http://codereview.chromium.org/7806009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99070 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_menu_manager.h b/chrome/browser/extensions/extension_menu_manager.h
index 0472225..af8345f 100644
--- a/chrome/browser/extensions/extension_menu_manager.h
+++ b/chrome/browser/extensions/extension_menu_manager.h
@@ -12,6 +12,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
@@ -247,7 +248,7 @@
 
   // Implements the NotificationObserver interface.
   virtual void Observe(int type, const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtensionMenuManagerTest, DeleteParent);