Splits PipelineImpl into main and media thread components.

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 4b35df5f8ab25491b2b5e16f2b55cc8dffa7bda8..12835699e8efdc29328e6d7341ae6cafe0b9977e 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -231,26 +231,15 @@ WebMediaPlayerImpl::WebMediaPlayerImpl(
 }
 
 WebMediaPlayerImpl::~WebMediaPlayerImpl() {
-  client_->setWebLayer(NULL);
-
   DCHECK(main_task_runner_->BelongsToCurrentThread());
 
+  suppress_destruction_errors_ = true;
+  client_->setWebLayer(NULL);
   if (delegate_) {
     delegate_->PlayerGone(delegate_id_);
     delegate_->RemoveObserver(delegate_id_);
   }
 
-  // Abort any pending IO so stopping the pipeline doesn't get blocked.
-  suppress_destruction_errors_ = true;
-  if (data_source_)
-    data_source_->Abort();
-  if (chunk_demuxer_) {
-    chunk_demuxer_->Shutdown();
-    chunk_demuxer_ = nullptr;
-  }
-
-  renderer_factory_.reset();
-
   // Pipeline must be stopped before it is destroyed.
   pipeline_.Stop();