Standardize usage of virtual/override/final in chrome/

chrome/utility/media_galleries/ipc_data_source.h

 // 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.
 
 #ifndef CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
 #define CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 10 matching lines @@
 
 // Provides the metadata parser with bytes from the browser process via IPC.
 // Class must be created and destroyed on the utility thread. Class may be used
 // as a DataSource on a different thread. The utility thread must not be blocked
 // for read operations to succeed.
 class IPCDataSource: public media::DataSource,
                      public UtilityMessageHandler {
  public:
   // May only be called on the utility thread.
   explicit IPCDataSource(int64 total_size);
-  virtual ~IPCDataSource();
+  ~IPCDataSource() override;
 
   // Implementation of DataSource. These methods may be called on any single
   // thread. First usage of these methods attaches a thread checker.
-  virtual void Stop() override;
-  virtual void Read(int64 position, int size, uint8* data,
-                    const ReadCB& read_cb) override;
-  virtual bool GetSize(int64* size_out) override;
-  virtual bool IsStreaming() override;
-  virtual void SetBitrate(int bitrate) override;
+  void Stop() override;
+  void Read(int64 position,
+            int size,
+            uint8* data,
+            const ReadCB& read_cb) override;
+  bool GetSize(int64* size_out) override;
+  bool IsStreaming() override;
+  void SetBitrate(int bitrate) override;
 
   // Implementation of UtilityMessageHandler. May only be called on the utility
   // thread.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   struct Request {
     Request();
     ~Request();
     uint8* destination;
     ReadCB callback;
   };
 
   void ReadOnUtilityThread(int64 position, int size, uint8* data,
@@ skipping 10 matching lines @@
 
   base::ThreadChecker utility_thread_checker_;
 
   // Enforces that the DataSource methods are called on one other thread only.
   base::ThreadChecker data_source_thread_checker_;
 };
 
 }  // namespace metadata
 
 #endif  // CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_