Enable video in linux build and remove unneeded ifdefs to guard windows.

media/media.gyp

 # Copyright (c) 2009 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,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 83 matching lines @@
         'filters/video_renderer_base.cc',
         'filters/video_renderer_base.h',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '..',
         ],
       },
       'conditions': [
         ['OS =="linux"', {
-          'sources!': [
-            'filters/ffmpeg_audio_decoder.cc',
-            'filters/ffmpeg_demuxer.cc',
-            'filters/ffmpeg_demuxer.h',
-            'filters/ffmpeg_glue.cc',
-            'filters/ffmpeg_video_decoder.cc',
-          ],
-          'sources/': [ ['exclude', '_(mac|win)\\.cc$'],
-                        ['exclude', '\\.mm?$' ] ],
+          'sources/': [ ['exclude', '_(mac|win)\\.cc$'] ],
         }],
         ['OS =="mac"', {
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/AudioToolbox.framework',
               '$(SDKROOT)/System/Library/Frameworks/CoreAudio.framework',
             ],
           },
           'sources!': [
             'filters/ffmpeg_audio_decoder.cc',
@@ skipping 93 matching lines @@
             'player/player_wtl.rc',
             'player/resource.h',
             'player/stdafx.h',
             'player/stdafx.cc',
           ],
         },
       ],
     }],
   ],
 }