Change AudioOutputDeviceClientImpl to use WebLocalFrameBase and move to modules.

third_party/WebKit/Source/modules/audio_output_devices/BUILD.gn

 # 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.
 
 import("//third_party/WebKit/Source/modules/modules.gni")
 
 blink_modules_sources("audio_output_devices") {
   sources = [
     "AudioOutputDeviceClient.cpp",
     "AudioOutputDeviceClient.h",
+    "AudioOutputDeviceClientImpl.cpp",
+    "AudioOutputDeviceClientImpl.h",
     "HTMLMediaElementAudioOutputDevice.cpp",
     "HTMLMediaElementAudioOutputDevice.h",
     "SetSinkIdCallbacks.cpp",
     "SetSinkIdCallbacks.h",
   ]
 }