Standardize usage of virtual/override/final in media/

media/blink/null_encrypted_media_player_support.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 MEDIA_BLINK_NULL_ENCRYPTED_MEDIA_PLAYER_SUPPORT_H_
 #define MEDIA_BLINK_NULL_ENCRYPTED_MEDIA_PLAYER_SUPPORT_H_
 
 #include "media/base/media_export.h"
 #include "media/blink/encrypted_media_player_support.h"
 
 namespace media {
 
 // A "null" implementation of the EncryptedMediaPlayerSupport interface
 // that indicates all key systems are not supported. This makes sure that
 // any attempts to play encrypted content always fail.
 class MEDIA_EXPORT NullEncryptedMediaPlayerSupport
     : public EncryptedMediaPlayerSupport {
  public:
   static scoped_ptr<EncryptedMediaPlayerSupport> Create(
       blink::WebMediaPlayerClient* client);
 
-  virtual ~NullEncryptedMediaPlayerSupport();
+  ~NullEncryptedMediaPlayerSupport() override;
 
   // Prefixed API methods.
-  virtual blink::WebMediaPlayer::MediaKeyException GenerateKeyRequest(
+  blink::WebMediaPlayer::MediaKeyException GenerateKeyRequest(
       blink::WebLocalFrame* frame,
       const blink::WebString& key_system,
       const unsigned char* init_data,
       unsigned init_data_length) override;
 
-  virtual blink::WebMediaPlayer::MediaKeyException AddKey(
+  blink::WebMediaPlayer::MediaKeyException AddKey(
       const blink::WebString& key_system,
       const unsigned char* key,
       unsigned key_length,
       const unsigned char* init_data,
       unsigned init_data_length,
       const blink::WebString& session_id) override;
 
-  virtual blink::WebMediaPlayer::MediaKeyException CancelKeyRequest(
+  blink::WebMediaPlayer::MediaKeyException CancelKeyRequest(
       const blink::WebString& key_system,
       const blink::WebString& session_id) override;
 
-
   // Unprefixed API methods.
-  virtual void SetInitialContentDecryptionModule(
+  void SetInitialContentDecryptionModule(
       blink::WebContentDecryptionModule* initial_cdm) override;
-  virtual void SetContentDecryptionModule(
+  void SetContentDecryptionModule(
       blink::WebContentDecryptionModule* cdm) override;
-  virtual void SetContentDecryptionModule(
+  void SetContentDecryptionModule(
       blink::WebContentDecryptionModule* cdm,
       blink::WebContentDecryptionModuleResult result) override;
 
-
   // Callback factory and notification methods used by WebMediaPlayerImpl.
 
   // Creates a callback that Demuxers can use to signal that the content
   // requires a key. This method makes sure the callback returned can be safely
   // invoked from any thread.
-  virtual Demuxer::NeedKeyCB CreateNeedKeyCB() override;
+  Demuxer::NeedKeyCB CreateNeedKeyCB() override;
 
   // Creates a callback that renderers can use to set decryptor
   // ready callback. This method makes sure the callback returned can be safely
   // invoked from any thread.
-  virtual SetDecryptorReadyCB CreateSetDecryptorReadyCB() override;
+  SetDecryptorReadyCB CreateSetDecryptorReadyCB() override;
 
   // Called to inform this object that the media pipeline encountered
   // and handled a decryption error.
-  virtual void OnPipelineDecryptError() override;
+  void OnPipelineDecryptError() override;
 
  private:
   NullEncryptedMediaPlayerSupport();
 
   DISALLOW_COPY_AND_ASSIGN(NullEncryptedMediaPlayerSupport);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_NULL_ENCRYPTED_MEDIA_PLAYER_SUPPORT_H_