[codec] Enable ffmpeg decoder.

TEST: fx shell run_test_component mediaplayer_test_util --loop Gravity.mkv
      fx shell run_test_component mediaplayer_test_util --test-seek Gravity.mkv
      <Chrome FuchsiaVideoDecoder unit tests>
Change-Id: Id2de66d803878654ab54c2bcaf0fec085a92ccf9
diff --git a/bin/media/codec_factory/codec_factory_impl.cc b/bin/media/codec_factory/codec_factory_impl.cc
index 2e8b7a5..34c1a6c 100644
--- a/bin/media/codec_factory/codec_factory_impl.cc
+++ b/bin/media/codec_factory/codec_factory_impl.cc
@@ -16,14 +16,10 @@
 const std::string kIsolateUrlOmx = "codec_runner_sw_omx";
 const std::string kIsolateUrlFfmpeg = "codec_runner_sw_ffmpeg";
 
-#ifdef FFMPEG_CODEC_FACTORY
 // TODO(turnage): Devise a better routing system between ffmpeg and omx codec
 // factories. Using this should be fine for now because omx does not service
 // this mime type and it is the first one we will roll out with ffmpeg.
 const std::string kFfmpegMimeType = "video/h264";
-#else
-const std::string kFfmpegMimeType = "disabled";
-#endif
 
 }  // namespace