[Clank] Implement MediaDrmStorageBridge with MediaDrmStorage

media/base/android/media_drm_bridge.h

 // Copyright (c) 2013 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_ANDROID_MEDIA_DRM_BRIDGE_H_
 #define MEDIA_BASE_ANDROID_MEDIA_DRM_BRIDGE_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 293 matching lines @@
   //   MediaCrypto creation has not been notified via NotifyMediaCryptoReady().
   // !j_media_crypto_->is_null():
   //   MediaCrypto creation succeeded and it has been notified.
   // j_media_crypto_->is_null():
   //   MediaCrypto creation failed and it has been notified.
   JavaObjectPtr j_media_crypto_;
 
   // The callback to create a ProvisionFetcher.
   CreateFetcherCB create_fetcher_cb_;
 
-  // The callback to create a MediaDrmStorage.
-  CreateStorageCB create_storage_cb_;
-
   // The ProvisionFetcher that requests and receives provisioning data.
   // Non-null iff when a provision request is pending.
   std::unique_ptr<ProvisionFetcher> provision_fetcher_;
 
   // Callbacks for firing session events.
   SessionMessageCB session_message_cb_;
   SessionClosedCB session_closed_cb_;
   SessionKeysChangeCB session_keys_change_cb_;
   SessionExpirationUpdateCB session_expiration_update_cb_;
 
@@ skipping 12 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<MediaDrmBridge> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaDrmBridge);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_DRM_BRIDGE_H_