Create video and audio decoder threads on demand.

webkit/media/filter_helpers.cc

Index: webkit/media/filter_helpers.cc
diff --git a/webkit/media/filter_helpers.cc b/webkit/media/filter_helpers.cc
index 3c376f91355b4dd39084ced8c200d772feb094d6..7f971e67cdbefb5c32ec6fbe712f45a0dbe81f47 100644
--- a/webkit/media/filter_helpers.cc
+++ b/webkit/media/filter_helpers.cc
@@ -21,9 +21,9 @@ static void AddDefaultDecodersToCollection(
     media::MessageLoopFactory* message_loop_factory,
     media::FilterCollection* filter_collection) {
   filter_collection->AddAudioDecoder(new media::FFmpegAudioDecoder(
-      message_loop_factory->GetMessageLoop("AudioDecoderThread")));
+      message_loop_factory, "AudioDecoderThread"));
   filter_collection->AddVideoDecoder(new media::FFmpegVideoDecoder(
-      message_loop_factory->GetMessageLoop("VideoDecoderThread")));
+      message_loop_factory, "VideoDecoderThread"));
 }
 
 bool BuildMediaStreamCollection(const WebKit::WebURL& url,