Standardize usage of virtual/override/final in content/

content/public/browser/download_manager.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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 38 matching lines @@
 class BrowserContext;
 class ByteStreamReader;
 class DownloadManagerDelegate;
 class DownloadQuery;
 class DownloadRequestHandle;
 struct DownloadCreateInfo;
 
 // Browser's download manager: manages all downloads and destination view.
 class CONTENT_EXPORT DownloadManager : public base::SupportsUserData::Data {
  public:
-  virtual ~DownloadManager() {}
+  ~DownloadManager() override {}
 
   // Sets/Gets the delegate for this DownloadManager. The delegate has to live
   // past its Shutdown method being called (by the DownloadManager).
   virtual void SetDelegate(DownloadManagerDelegate* delegate) = 0;
   virtual DownloadManagerDelegate* GetDelegate() const = 0;
 
   // Shutdown the download manager. Content calls this when BrowserContext is
   // being destructed. If the embedder needs this to be called earlier, it can
   // call it. In that case, the delegate's Shutdown() method will only be called
   // once.
@@ skipping 104 matching lines @@
   virtual void CheckForHistoryFilesRemoval() = 0;
 
   // Get the download item for |id| if present, no matter what type of download
   // it is or state it's in.
   virtual DownloadItem* GetDownload(uint32 id) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_MANAGER_H_