[Cast] Refactor/clean-up VideoReceiver to match AudioReceiver as closely as possible.

media/cast/video_receiver/codecs/vp8/vp8_decoder.gyp

-# Copyright 2013 The Chromium Authors. All rights reserved.
-# Use of the source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-{
-  'variables': {
-    'chromium_code': 1,
-  },
-  'targets': [
-    {
-      'target_name': 'cast_vp8_decoder',
-      'type': 'static_library',
-      'include_dirs': [
-        '<(DEPTH)/',
-        '<(DEPTH)/third_party/',
-        '<(DEPTH)/third_party/libvpx/',
-      ],
-      'sources': [
-        'vp8_decoder.cc',
-        'vp8_decoder.h',
-      ], # source
-      'dependencies': [
-        '<(DEPTH)/base/base.gyp:base',
-        '<(DEPTH)/third_party/libvpx/libvpx.gyp:libvpx',
-      ],
-    },
-  ],
-}