Standardize usage of virtual/override/final in content/browser/

content/browser/appcache/appcache_dispatcher_host.h

Index: content/browser/appcache/appcache_dispatcher_host.h
diff --git a/content/browser/appcache/appcache_dispatcher_host.h b/content/browser/appcache/appcache_dispatcher_host.h
index 2631605105ae71cc3c98cf81967e7400be0bf176..c0a615ed259cd58ef429c23e54c513563b3d5ed9 100644
--- a/content/browser/appcache/appcache_dispatcher_host.h
+++ b/content/browser/appcache/appcache_dispatcher_host.h
@@ -27,14 +27,14 @@ class AppCacheDispatcherHost : public BrowserMessageFilter {
                          int process_id);
 
   // BrowserIOMessageFilter implementation
-  virtual void OnChannelConnected(int32 peer_pid) override;
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  void OnChannelConnected(int32 peer_pid) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  protected:
-  virtual ~AppCacheDispatcherHost();
+  ~AppCacheDispatcherHost() override;
 
   // BrowserMessageFilter override.
-  virtual void BadMessageReceived() override;
+  void BadMessageReceived() override;
 
  private:
   // IPC message handlers