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

content/renderer/service_worker/embedded_worker_devtools_agent.h

Index: content/renderer/service_worker/embedded_worker_devtools_agent.h
diff --git a/content/renderer/service_worker/embedded_worker_devtools_agent.h b/content/renderer/service_worker/embedded_worker_devtools_agent.h
index b294c3462294c5bd1a9a5ca0de99c502f3ca8c6b..97c15824fe927e12c7f8ca46fa497f8ac9a4907e 100644
--- a/content/renderer/service_worker/embedded_worker_devtools_agent.h
+++ b/content/renderer/service_worker/embedded_worker_devtools_agent.h
@@ -25,9 +25,9 @@ class EmbeddedWorkerDevToolsAgent : public IPC::Listener {
  public:
   EmbeddedWorkerDevToolsAgent(blink::WebEmbeddedWorker* webworker,
                               int route_id);
-  virtual ~EmbeddedWorkerDevToolsAgent();
+  ~EmbeddedWorkerDevToolsAgent() override;
 
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   void OnAttach(const std::string& host_id);