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

chrome/browser/chrome_browser_main_android.h

Index: chrome/browser/chrome_browser_main_android.h
diff --git a/chrome/browser/chrome_browser_main_android.h b/chrome/browser/chrome_browser_main_android.h
index f0d68d5524dc049cc82b3929927985a880da82eb..8781d9826a62795c0245c396831666c631c2c797 100644
--- a/chrome/browser/chrome_browser_main_android.h
+++ b/chrome/browser/chrome_browser_main_android.h
@@ -17,15 +17,15 @@ class ChromeBrowserMainPartsAndroid : public ChromeBrowserMainParts {
  public:
   explicit ChromeBrowserMainPartsAndroid(
       const content::MainFunctionParams& parameters);
-  virtual ~ChromeBrowserMainPartsAndroid();
+  ~ChromeBrowserMainPartsAndroid() override;
 
   // content::BrowserMainParts overrides.
-  virtual int PreCreateThreads() override;
-  virtual void PostProfileInit() override;
-  virtual void PreEarlyInitialization() override;
+  int PreCreateThreads() override;
+  void PostProfileInit() override;
+  void PreEarlyInitialization() override;
 
   // ChromeBrowserMainParts overrides.
-  virtual void ShowMissingLocaleMessageBox() override;
+  void ShowMissingLocaleMessageBox() override;
 
  private:
   scoped_ptr<base::MessageLoop> main_message_loop_;