replace OVERRIDE and FINAL with override and final in chrome/browser/extensions/

chrome/browser/extensions/extension_garbage_collector_factory.h

Index: chrome/browser/extensions/extension_garbage_collector_factory.h
diff --git a/chrome/browser/extensions/extension_garbage_collector_factory.h b/chrome/browser/extensions/extension_garbage_collector_factory.h
index f1ce77df6647d39249859e048352b421c16f8ea5..19f0bf6dd18e9f79beb17c2c1786ada30e880096 100644
--- a/chrome/browser/extensions/extension_garbage_collector_factory.h
+++ b/chrome/browser/extensions/extension_garbage_collector_factory.h
@@ -34,10 +34,10 @@ class ExtensionGarbageCollectorFactory
 
   // BrowserContextKeyedServiceFactory overrides:
   virtual KeyedService* BuildServiceInstanceFor(
-      content::BrowserContext* context) const OVERRIDE;
+      content::BrowserContext* context) const override;
 
-  virtual bool ServiceIsCreatedWithBrowserContext() const OVERRIDE;
-  virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
+  virtual bool ServiceIsCreatedWithBrowserContext() const override;
+  virtual bool ServiceIsNULLWhileTesting() const override;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionGarbageCollectorFactory);
 };