Standardize usage of virtual/override/final in chrome/browser/safe_browsing/

chrome/browser/safe_browsing/download_feedback.cc

 // 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.
 
 #include "chrome/browser/safe_browsing/download_feedback.h"
 
 #include "base/bind.h"
 #include "base/files/file_util_proxy.h"
 #include "base/metrics/histogram.h"
 #include "base/task_runner.h"
@@ skipping 20 matching lines @@
 
 // Handles the uploading of a single downloaded binary to the safebrowsing
 // download feedback service.
 class DownloadFeedbackImpl : public DownloadFeedback {
  public:
   DownloadFeedbackImpl(net::URLRequestContextGetter* request_context_getter,
                        base::TaskRunner* file_task_runner,
                        const base::FilePath& file_path,
                        const std::string& ping_request,
                        const std::string& ping_response);
-  virtual ~DownloadFeedbackImpl();
+  ~DownloadFeedbackImpl() override;
 
-  virtual void Start(const base::Closure& finish_callback) override;
+  void Start(const base::Closure& finish_callback) override;
 
-  virtual const std::string& GetPingRequestForTesting() const override {
+  const std::string& GetPingRequestForTesting() const override {
     return ping_request_;
   }
 
-  virtual const std::string& GetPingResponseForTesting() const override {
+  const std::string& GetPingResponseForTesting() const override {
     return ping_response_;
   }
 
  private:
   // Callback for TwoPhaseUploader completion.  Relays the result to the
   // |finish_callback|.
   void FinishedUpload(base::Closure finish_callback,
                       TwoPhaseUploader::State state,
                       int net_error,
                       int response_code,
@@ skipping 152 matching lines @@
     return new DownloadFeedbackImpl(
         request_context_getter, file_task_runner, file_path, ping_request,
         ping_response);
   return DownloadFeedback::factory_->CreateDownloadFeedback(
         request_context_getter, file_task_runner, file_path, ping_request,
         ping_response);
 }
 
 }  // namespace safe_browsing