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

content/browser/download/download_request_handle.h

 // Copyright (c) 2012 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_DOWNLOAD_DOWNLOAD_REQUEST_HANDLE_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_HANDLE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 27 matching lines @@
   virtual void CancelRequest() const = 0;
 
   // Describes the object.
   virtual std::string DebugString() const = 0;
 };
 
 
 class CONTENT_EXPORT DownloadRequestHandle
     : public DownloadRequestHandleInterface {
  public:
-  virtual ~DownloadRequestHandle();
+  ~DownloadRequestHandle() override;
 
   // Create a null DownloadRequestHandle: getters will return null, and
   // all actions are no-ops.
   // TODO(rdsmith): Ideally, actions would be forbidden rather than
   // no-ops, to confirm that no non-testing code actually uses
   // a null DownloadRequestHandle.  But for now, we need the no-op
   // behavior for unit tests.  Long-term, this should be fixed by
   // allowing mocking of ResourceDispatcherHost in unit tests.
   DownloadRequestHandle();
 
   // Note that |rdh| is required to be non-null.
   DownloadRequestHandle(const base::WeakPtr<DownloadResourceHandler>& handler,
                         int child_id,
                         int render_view_id,
                         int request_id);
 
   // Implement DownloadRequestHandleInterface interface.
-  virtual WebContents* GetWebContents() const override;
-  virtual DownloadManager* GetDownloadManager() const override;
-  virtual void PauseRequest() const override;
-  virtual void ResumeRequest() const override;
-  virtual void CancelRequest() const override;
-  virtual std::string DebugString() const override;
+  WebContents* GetWebContents() const override;
+  DownloadManager* GetDownloadManager() const override;
+  void PauseRequest() const override;
+  void ResumeRequest() const override;
+  void CancelRequest() const override;
+  std::string DebugString() const override;
 
  private:
   base::WeakPtr<DownloadResourceHandler> handler_;
 
   // The ID of the child process that started the download.
   int child_id_;
 
   // The ID of the render view that started the download.
   int render_view_id_;
 
   // The ID associated with the request used for the download.
   int request_id_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_HANDLE_H_