Update {virtual,override,final} to follow C++11 style.

components/devtools_bridge/socket_tunnel_server.cc

 // Copyright 2014 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.
 
 #include "components/devtools_bridge/socket_tunnel_server.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "components/devtools_bridge/abstract_data_channel.h"
 #include "components/devtools_bridge/session_dependency_factory.h"
@@ skipping 38 matching lines @@
  protected:
   net::StreamSocket* socket() override {
     return &socket_;
   }
 
   void OnDataPacketRead(const void* data, size_t length) override {
     delegate_->SendPacket(data, length);
     ReadNextChunk();
   }
 
-  virtual void OnReadError(int error) override {
+  void OnReadError(int error) override {
     socket()->Disconnect();
     SendControlPacket(SERVER_CLOSE);
     delegate_->RemoveConnection(index_);
     delegate_ = NULL;
   }
 
  private:
   void OnConnectionComplete(int result) {
     if (result == net::OK) {
       SendControlPacket(SERVER_OPEN_ACK);
@@ skipping 187 matching lines @@
                               controller.Pass()));
 
   data_channel_->RegisterObserver(data_channel_observer.Pass());
 }
 
 SocketTunnelServer::~SocketTunnelServer() {
   data_channel_->UnregisterObserver();
 }
 
 }  // namespace devtools_bridge