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

content/renderer/devtools/devtools_agent_filter.h

Index: content/renderer/devtools/devtools_agent_filter.h
diff --git a/content/renderer/devtools/devtools_agent_filter.h b/content/renderer/devtools/devtools_agent_filter.h
index a3470eeb6b1eef03c28a97584bddc56376b8aa89..48831a30c6d35abc76cc364d216509d81cafeeb4 100644
--- a/content/renderer/devtools/devtools_agent_filter.h
+++ b/content/renderer/devtools/devtools_agent_filter.h
@@ -33,14 +33,14 @@ class DevToolsAgentFilter : public IPC::MessageFilter {
   static void SendRpcMessage(const DevToolsMessageData& data);
 
   // IPC::MessageFilter override. Called on IO thread.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   // Called on the main thread.
   void AddEmbeddedWorkerRouteOnMainThread(int32 routing_id);
   void RemoveEmbeddedWorkerRouteOnMainThread(int32 routing_id);
 
  protected:
-  virtual ~DevToolsAgentFilter();
+  ~DevToolsAgentFilter() override;
 
  private:
   void OnDispatchOnInspectorBackend(const std::string& message);