media: Set MediaClientAndroid in the GPU process.

components/cdm/browser/BUILD.gn

 # 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.
 
 source_set("browser") {
   sources = [
     "cdm_message_filter_android.cc",
     "cdm_message_filter_android.h",
-    "widevine_drm_delegate_android.cc",
-    "widevine_drm_delegate_android.h",
   ]
 
   deps = [
     "//base",
     "//components/cdm/common",
     "//content/public/browser",
     "//content/public/common",
     "//ipc",
     "//media",
   ]
 }