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

cloud_print/gcp20/prototype/cloud_print_url_request_context_getter.h

 // Copyright 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 CLOUD_PRINT_GCP20_PROTOTYPE_CLOUD_PRINT_URL_REQUEST_CONTEXT_GETTER_H_
 #define CLOUD_PRINT_GCP20_PROTOTYPE_CLOUD_PRINT_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/url_request/url_request_context_getter.h"
 
 // Used to return a dummy context, which lives on the message loop
 // given in the constructor.
 class CloudPrintURLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   // |task_runner| must not be NULL.
   explicit CloudPrintURLRequestContextGetter(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
 
   // URLRequestContextGetter implementation.
-  virtual net::URLRequestContext* GetURLRequestContext() override;
+  net::URLRequestContext* GetURLRequestContext() override;
 
-  virtual scoped_refptr<base::SingleThreadTaskRunner>
+  scoped_refptr<base::SingleThreadTaskRunner>
     GetNetworkTaskRunner() const override;
 
  private:
-  virtual ~CloudPrintURLRequestContextGetter();
+  ~CloudPrintURLRequestContextGetter() override;
 
   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
   scoped_ptr<net::URLRequestContext> context_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintURLRequestContextGetter);
 };
 
 #endif  // CLOUD_PRINT_GCP20_PROTOTYPE_CLOUD_PRINT_URL_REQUEST_CONTEXT_GETTER_H_