Revert of Revert of Revert of Remove threading from RendererGpuVideoAcceleratorFactories

content/renderer/media/webmediaplayer_impl.cc

Index: content/renderer/media/webmediaplayer_impl.cc
diff --git a/content/renderer/media/webmediaplayer_impl.cc b/content/renderer/media/webmediaplayer_impl.cc
index cbc29e6df5a1127882e9698882425d6a31df5add..b314732cf47c2ba22f1f12c39a0466308def80c8 100644
--- a/content/renderer/media/webmediaplayer_impl.cc
+++ b/content/renderer/media/webmediaplayer_impl.cc
@@ -1204,7 +1204,10 @@
     chunk_demuxer_ = NULL;
   }
 
-  gpu_factories_ = NULL;
+  if (gpu_factories_.get()) {
+    gpu_factories_->Abort();
+    gpu_factories_ = NULL;
+  }
 
   // Make sure to kill the pipeline so there's no more media threads running.
   // Note: stopping the pipeline might block for a long time.