Moving MockFFmpeg to its own file and some media.gyp cleanup.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 8453038613e6b5e12844db1ed1c11e8a2e297acb..054578813db0e24cf09d3ceef11df6e1057cb77e 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -57,9 +57,6 @@
         'base/media.h',
         'base/media_format.cc',
         'base/media_format.h',
-        'base/mock_filter_host.h',
-        'base/mock_media_filters.h',
-        'base/mock_pipeline.h',
         'base/pipeline.h',
         'base/pipeline_impl.cc',
         'base/pipeline_impl.h',
@@ -150,6 +147,11 @@
         'audio/mac/audio_output_mac_unittest.cc',
         'audio/simple_sources_unittest.cc',
         'base/data_buffer_unittest.cc',
+        'base/mock_ffmpeg.cc',
+        'base/mock_ffmpeg.h',
+        'base/mock_filter_host.h',
+        'base/mock_media_filters.h',
+        'base/mock_pipeline.h',
         'base/pipeline_impl_unittest.cc',
         'base/run_all_unittests.cc',
         'base/seekable_buffer_unittest.cc',
@@ -172,6 +174,7 @@
             '../build/linux/system.gyp:gtk',
           ],
           'sources!': [
+            'base/mock_ffmpeg.cc',
             'filters/ffmpeg_demuxer_unittest.cc',
             'filters/ffmpeg_glue_unittest.cc',
             'filters/ffmpeg_video_decoder_unittest.cc',
@@ -179,6 +182,7 @@
         }],
         ['OS=="mac"', {
           'sources!': [
+            'base/mock_ffmpeg.cc',
             'filters/ffmpeg_demuxer_unittest.cc',
             'filters/ffmpeg_glue_unittest.cc',
             'filters/ffmpeg_video_decoder_unittest.cc',
@@ -220,20 +224,20 @@
             '../third_party/ffmpeg/ffmpeg.gyp:ffmpeg',
           ],
           'sources': [
-	    'player/list.h',
-	    'player/mainfrm.h',
-	    'player/movie.cc',
-	    'player/movie.h',
-	    'player/player_wtl.cc',
-	    'player/player_wtl.rc',
-	    'player/props.h',
-	    'player/seek.h',
-	    'player/resource.h',
-	    'player/stdafx.h',
-	    'player/view.h',
-	    'player/wtl_renderer.cc',
-	    'player/wtl_renderer.h',
-	  ],
+            'player/list.h',
+            'player/mainfrm.h',
+            'player/movie.cc',
+            'player/movie.h',
+            'player/player_wtl.cc',
+            'player/player_wtl.rc',
+            'player/props.h',
+            'player/seek.h',
+            'player/resource.h',
+            'player/stdafx.h',
+            'player/view.h',
+            'player/wtl_renderer.cc',
+            'player/wtl_renderer.h',
+          ],
           'msvs_settings': {
             'VCLinkerTool': {
               'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS