fix builds with vpx and/or ffmpeg disabled

media/media.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 627 matching lines @@
             'filters/ffmpeg_demuxer.h',
             'filters/ffmpeg_glue.cc',
             'filters/ffmpeg_glue.h',
             'filters/ffmpeg_h264_to_annex_b_bitstream_converter.cc',
             'filters/ffmpeg_h264_to_annex_b_bitstream_converter.h',
             'filters/ffmpeg_video_decoder.cc',
             'filters/ffmpeg_video_decoder.h',
             'filters/in_memory_url_protocol.cc',
             'filters/in_memory_url_protocol.h',
           ],
+          'defines': [
+            'MEDIA_DISABLE_FFMPEG',

[xhwang, 2015/01/07 17:12:30]

also add 'direct_dependent_settings' (same as l.660)?

You can use MEDIA_DISABLE_FFMPEG here:
https://code.google.com/p/chromium/codesearch#chromium/src/media/mojo/service...

and here:
https://code.google.com/p/chromium/codesearch#chromium/src/media/test/pipelin...

[Mostyn Bramley-Moore, 2015/01/07 19:29:53]

Done.

+          ],
         }],
         ['media_use_libvpx==1', {
           'dependencies': [
             '<(DEPTH)/third_party/libvpx/libvpx.gyp:libvpx',
           ],
         }, {  # media_use_libvpx==0
+          'defines': [
+            'MEDIA_DISABLE_LIBVPX',
+          ],
           'direct_dependent_settings': {
             'defines': [
               'MEDIA_DISABLE_LIBVPX',
             ],
           },
           # Exclude the sources that depend on libvpx.
           'sources!': [
             'filters/vpx_video_decoder.cc',
             'filters/vpx_video_decoder.h',
           ],
@@ skipping 1226 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'media_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }