Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index c072192603edd3021c299bc44da6e8e24c507fef..4c1c58e3755fc12e0a395b2d3612420407cc602c 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -322,7 +322,7 @@ class ExtensionService
   // Unload the specified extension.
   virtual void UnloadExtension(
       const std::string& extension_id,
-      extension_misc::UnloadedExtensionReason reason);
+      extension_misc::UnloadedExtensionReason reason) OVERRIDE;
 
   // Unload all extensions. This is currently only called on shutdown, and
   // does not send notifications.
@@ -369,7 +369,7 @@ class ExtensionService
   // Adds |extension| to this ExtensionService and notifies observers than an
   // extension has been loaded.  Called by the backend after an extension has
   // been loaded from a file and installed.
-  virtual void AddExtension(const Extension* extension);
+  virtual void AddExtension(const Extension* extension) OVERRIDE;
 
   // Called by the backend when an extension has been installed.
   void OnExtensionInstalled(