Standardize usage of virtual/override/final in chrome/browser/signin/

chrome/browser/signin/principals_message_filter.h

Index: chrome/browser/signin/principals_message_filter.h
diff --git a/chrome/browser/signin/principals_message_filter.h b/chrome/browser/signin/principals_message_filter.h
index 8eb9fe58eea684e97ff655bb5452bb0ea02ebb57..5d37864686d0f56bc2f13927bffeb37317555b04 100644
--- a/chrome/browser/signin/principals_message_filter.h
+++ b/chrome/browser/signin/principals_message_filter.h
@@ -17,13 +17,12 @@ class PrincipalsMessageFilter : public content::BrowserMessageFilter {
   explicit PrincipalsMessageFilter(int render_process_id);
 
   // content::BrowserMessageFilter implementation.
-  virtual void OverrideThreadForMessage(
-      const IPC::Message& message,
-      content::BrowserThread::ID* thread) override;
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  void OverrideThreadForMessage(const IPC::Message& message,
+                                content::BrowserThread::ID* thread) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
-  virtual ~PrincipalsMessageFilter();
+  ~PrincipalsMessageFilter() override;
 
   void OnMsgShowBrowserAccountManagementUI();
   void OnMsgGetManagedAccounts(const GURL& url,