Update {virtual,override,final} to follow C++11 style.

chrome/browser/android/recently_closed_tabs_bridge.h

Index: chrome/browser/android/recently_closed_tabs_bridge.h
diff --git a/chrome/browser/android/recently_closed_tabs_bridge.h b/chrome/browser/android/recently_closed_tabs_bridge.h
index ac11f3f6582485a35187e4117c3f9735f4e915c3..01eb50df2f52604a922e4e35d7517c07513b567e 100644
--- a/chrome/browser/android/recently_closed_tabs_bridge.h
+++ b/chrome/browser/android/recently_closed_tabs_bridge.h
@@ -34,16 +34,16 @@ class RecentlyClosedTabsBridge : public TabRestoreServiceObserver {
 
   // Observer callback for TabRestoreServiceObserver. Notifies the registered
   // callback that the recently closed tabs list has changed.
-  virtual void TabRestoreServiceChanged(TabRestoreService* service) override;
+  void TabRestoreServiceChanged(TabRestoreService* service) override;
 
   // Observer callback when our associated TabRestoreService is destroyed.
-  virtual void TabRestoreServiceDestroyed(TabRestoreService* service) override;
+  void TabRestoreServiceDestroyed(TabRestoreService* service) override;
 
   // Registers JNI methods.
   static bool Register(JNIEnv* env);
 
  private:
-  virtual ~RecentlyClosedTabsBridge();
+  ~RecentlyClosedTabsBridge() override;
 
   // Construct and initialize tab_restore_service_ if it's NULL.
   // tab_restore_service_ may still be NULL, however, in incognito mode.