WeakPtr destruction order cleanup: media edition.

media/filters/ffmpeg_audio_decoder.cc

Index: media/filters/ffmpeg_audio_decoder.cc
diff --git a/media/filters/ffmpeg_audio_decoder.cc b/media/filters/ffmpeg_audio_decoder.cc
index 3ea70ff02407ac1df9d9b9b9ef5a39ae0cf85c07..f48dbcdfcb33e42ae55e60e697c9e87948ebdc0c 100644
--- a/media/filters/ffmpeg_audio_decoder.cc
+++ b/media/filters/ffmpeg_audio_decoder.cc
@@ -72,7 +72,6 @@ static void ReleaseAudioBufferImpl(void* opaque, uint8* data) {
 FFmpegAudioDecoder::FFmpegAudioDecoder(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
     : task_runner_(task_runner),
-      weak_factory_(this),
       demuxer_stream_(NULL),
       bytes_per_channel_(0),
       channel_layout_(CHANNEL_LAYOUT_NONE),
@@ -80,8 +79,8 @@ FFmpegAudioDecoder::FFmpegAudioDecoder(
       samples_per_second_(0),
       av_sample_format_(0),
       last_input_timestamp_(kNoTimestamp()),
-      output_frames_to_drop_(0) {
-}
+      output_frames_to_drop_(0),
+      weak_factory_(this) {}
 
 void FFmpegAudioDecoder::Initialize(
     DemuxerStream* stream,