Encrypted Media: Add DefaultCdmFactory.

media/cdm/default_cdm_factory.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_BASE_CDM_FACTORY_H_
-#define MEDIA_BASE_CDM_FACTORY_H_
+#ifndef MEDIA_CDM_DEFAULT_CDM_FACTORY_H_
+#define MEDIA_CDM_DEFAULT_CDM_FACTORY_H_
 
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "media/base/media_export.h"
-#include "media/base/media_keys.h"
-
-class GURL;
+#include "base/macros.h"
+#include "media/base/cdm_factory.h"
 
 namespace media {
 
-class MEDIA_EXPORT CdmFactory {
+class DefaultCdmFactory : public CdmFactory {
  public:
-  CdmFactory();
-  virtual ~CdmFactory();
+  DefaultCdmFactory();
+  ~DefaultCdmFactory() final;
 
-  virtual scoped_ptr<MediaKeys> Create(
+  // CdmFactory implementation.
+  scoped_ptr<MediaKeys> Create(
       const std::string& key_system,
       const GURL& security_origin,
       const SessionMessageCB& session_message_cb,
       const SessionReadyCB& session_ready_cb,
       const SessionClosedCB& session_closed_cb,
       const SessionErrorCB& session_error_cb,
       const SessionKeysChangeCB& session_keys_change_cb,
-      const SessionExpirationUpdateCB& session_expiration_update_cb) = 0;
+      const SessionExpirationUpdateCB& session_expiration_update_cb) final;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(CdmFactory);
+  DISALLOW_COPY_AND_ASSIGN(DefaultCdmFactory);
 };
 
 }  // namespace media
 
-#endif  // MEDIA_BASE_CDM_FACTORY_H_
+#endif  // MEDIA_CDM_DEFAULT_CDM_FACTORY_H_