Remove the lifetime hack in ImageLoader where it keeps its assoc element alive

third_party/WebKit/Source/core/html/HTMLVideoElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 77 matching lines @@
   return video;
 }
 
 DEFINE_TRACE(HTMLVideoElement) {
   visitor->Trace(image_loader_);
   visitor->Trace(custom_controls_fullscreen_detector_);
   visitor->Trace(remoting_interstitial_);
   HTMLMediaElement::Trace(visitor);
 }
 
+bool HTMLVideoElement::HasPendingActivity() const {
+  return HTMLMediaElement::HasPendingActivity() ||
+         (image_loader_ && image_loader_->HasPendingActivity());
+}
+
 Node::InsertionNotificationRequest HTMLVideoElement::InsertedInto(
     ContainerNode* insertion_point) {
   if (insertion_point->isConnected() && custom_controls_fullscreen_detector_)
     custom_controls_fullscreen_detector_->Attach();
 
   return HTMLMediaElement::InsertedInto(insertion_point);
 }
 
 void HTMLVideoElement::RemovedFrom(ContainerNode* insertion_point) {
   HTMLMediaElement::RemovedFrom(insertion_point);
@@ skipping 411 matching lines @@
 }
 
 void HTMLVideoElement::DisableMediaRemoting() {
   if (GetWebMediaPlayer())
     GetWebMediaPlayer()->RequestRemotePlaybackDisabled(true);
   media_remoting_status_ = MediaRemotingStatus::kDisabled;
   MediaRemotingStopped();
 }
 
 }  // namespace blink