Revert of [Chromecast] Process streams with different post-processing.

chromecast/media/base/BUILD.gn

 # Copyright 2015 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("//chromecast/chromecast.gni")
 
 source_set("key_systems") {
   sources = [
     "key_systems_common.cc",
     "key_systems_common.h",
   ]
 
   if (use_playready) {
     public_configs = [ "//chromecast:playready_config" ]
   }
 
   deps = [
     "//base",
     "//chromecast/public/media",
     "//media",
     "//third_party/widevine/cdm:headers",
   ]
 }
 
 source_set("base") {
   sources = [
-    "audio_device_ids.cc",
-    "audio_device_ids.h",
     "decrypt_context_impl.cc",
     "decrypt_context_impl.h",
     "decrypt_context_impl_clearkey.cc",
     "decrypt_context_impl_clearkey.h",
     "media_caps.cc",
     "media_caps.h",
     "media_codec_support.cc",
     "media_codec_support.h",
     "media_resource_tracker.cc",
     "media_resource_tracker.h",
@@ skipping 17 matching lines @@
 
   deps = [
     "//base",
     "//chromecast/base",
     "//crypto",
     "//crypto:platform",
     "//media",
     "//ui/gfx/geometry",
   ]
 }