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

content/browser/devtools/ipc_devtools_agent_host.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_IPC_DEVTOOLS_AGENT_HOST_H_
 #define CONTENT_BROWSER_DEVTOOLS_IPC_DEVTOOLS_AGENT_HOST_H_
 
 #include "content/browser/devtools/devtools_agent_host_impl.h"
 
 namespace IPC {
 class Message;
 }
 
 namespace content {
 
 class CONTENT_EXPORT IPCDevToolsAgentHost : public DevToolsAgentHostImpl {
  public:
   // DevToolsAgentHostImpl implementation.
-  virtual void Attach() override;
-  virtual void Detach() override;
-  virtual void DispatchProtocolMessage(const std::string& message) override;
-  virtual void InspectElement(int x, int y) override;
+  void Attach() override;
+  void Detach() override;
+  void DispatchProtocolMessage(const std::string& message) override;
+  void InspectElement(int x, int y) override;
 
  protected:
   IPCDevToolsAgentHost();
-  virtual ~IPCDevToolsAgentHost();
+  ~IPCDevToolsAgentHost() override;
 
   void Reattach(const std::string& saved_agent_state);
   void ProcessChunkedMessageFromAgent(const std::string& message,
                                       uint32 total_size);
 
   virtual void SendMessageToAgent(IPC::Message* msg) = 0;
   virtual void OnClientAttached() = 0;
   virtual void OnClientDetached() = 0;
 
  private:
   std::string message_buffer_;
   uint32 message_buffer_size_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_IPC_DEVTOOLS_AGENT_HOST_H_