Remove BLINK_ASSERT() and BLINK_ASSERT_NOT_REACHED() macros.

media/blink/mock_webframeclient.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_MOCK_WEBFRAMECLIENT_H_
 #define MEDIA_BLINK_MOCK_WEBFRAMECLIENT_H_
 
 #include "third_party/WebKit/public/web/WebFrameClient.h"
 
 namespace media {
 
-class MockWebFrameClient : public blink::WebFrameClient {};
+class MockWebFrameClient : public blink::WebFrameClient {
+  void checkIfAudioSinkExistsAndIsAuthorized(
+      const blink::WebString& sinkId,
+      const blink::WebSecurityOrigin& origin,
+      blink::WebSetSinkIdCallbacks* callbacks) override;
+};
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_MOCK_WEBFRAMECLIENT_H_