Introduce CancelUponDeferral() to buffered media loaders.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index 93f3bd43cf20d7f92c05ff5cc423e3a716159334..87c90c541d26c34f624b162754eb6c0eef33c72e 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -789,8 +789,7 @@ void WebMediaPlayerImpl::OnPipelineMetadata(
 
   pipeline_metadata_ = metadata;
 
-  UMA_HISTOGRAM_ENUMERATION("Media.VideoRotation",
-                            metadata.video_rotation,
+  UMA_HISTOGRAM_ENUMERATION("Media.VideoRotation", metadata.video_rotation,
                             VIDEO_ROTATION_MAX + 1);
   SetReadyState(WebMediaPlayer::ReadyStateHaveMetadata);
 
@@ -824,6 +823,11 @@ void WebMediaPlayerImpl::OnPipelineBufferingStateChanged(
   DCHECK_EQ(buffering_state, BUFFERING_HAVE_ENOUGH);
   SetReadyState(WebMediaPlayer::ReadyStateHaveEnoughData);
 
+  // Let the DataSource know we have enough data. It may use this information to
+  // release unused network connections.
+  if (data_source_)
+    data_source_->OnBufferingHaveEnough();
+
   // Blink expects a timeChanged() in response to a seek().
   if (should_notify_time_changed_)
     client_->timeChanged();