Remove BLINK_ASSERT() and BLINK_ASSERT_NOT_REACHED() macros.

content/test/mock_webframeclient.cc

+// Copyright 2016 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.
+
+#include "content/test/mock_webframeclient.h"
+
+#include "base/logging.h"
+
+namespace content {
+
+void MockWebFrameClient::checkIfAudioSinkExistsAndIsAuthorized(
+    const blink::WebString& sinkId,
+    const blink::WebSecurityOrigin&,
+    blink::WebSetSinkIdCallbacks*) {
+  NOTREACHED();
+}
+
+}  // namespace content