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

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

Index: third_party/WebKit/Source/core/html/HTMLVideoElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLVideoElement.cpp b/third_party/WebKit/Source/core/html/HTMLVideoElement.cpp
index a3466a06728f0d90d5f9c40b17fdf6c67cb4c2d1..98038c20872b523e33847478aa8e8652a4b2b636 100644
--- a/third_party/WebKit/Source/core/html/HTMLVideoElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLVideoElement.cpp
@@ -95,6 +95,11 @@ DEFINE_TRACE(HTMLVideoElement) {
   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_)