Make base::Timer sequence-friendly.

media/filters/android/media_codec_audio_decoder.cc

Index: media/filters/android/media_codec_audio_decoder.cc
diff --git a/media/filters/android/media_codec_audio_decoder.cc b/media/filters/android/media_codec_audio_decoder.cc
index 0fe3b81bd21b773e1156a0069340bb3ce8b2e9a1..8a7d48fc4aeae7dbb663209f441f71067cf8cc65 100644
--- a/media/filters/android/media_codec_audio_decoder.cc
+++ b/media/filters/android/media_codec_audio_decoder.cc
@@ -140,7 +140,8 @@ bool MediaCodecAudioDecoder::CreateMediaCodecLoop() {
 
   codec_loop_.reset(
       new MediaCodecLoop(base::android::BuildInfo::GetInstance()->sdk_int(),
-                         this, std::move(audio_codec_bridge)));
+                         this, std::move(audio_codec_bridge),
+                         scoped_refptr<base::SingleThreadTaskRunner>()));
 
   return true;
 }