Revert of Buffer 2 seconds of data in the ffmpeg demuxer.

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index 7195d1fd04af137daea4b1e35c0e5deb429efff8..d329492be4808fca7491f6b9fbe49c523f48f805 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -779,9 +779,16 @@
 }
 
 bool FFmpegDemuxerStream::HasAvailableCapacity() {
-  // Try to have two second's worth of encoded data per stream.
-  const base::TimeDelta kCapacity = base::TimeDelta::FromSeconds(2);
+  // TODO(scherkus): Remove this return and reenable time-based capacity
+  // after our data sources support canceling/concurrent reads, see
+  // http://crbug.com/165762 for details.
+#if 1
+  return !read_cb_.is_null();
+#else
+  // Try to have one second's worth of encoded data per stream.
+  const base::TimeDelta kCapacity = base::TimeDelta::FromSeconds(1);
   return buffer_queue_.IsEmpty() || buffer_queue_.Duration() < kCapacity;
+#endif
 }
 
 size_t FFmpegDemuxerStream::MemoryUsage() const {