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

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

 /*
  * Copyright (C) 2007, 2010 Apple Inc. All rights reserved.
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 // https://html.spec.whatwg.org/#the-video-element
 
-interface HTMLVideoElement : HTMLMediaElement {
+[
+    ActiveScriptWrappable,
+] interface HTMLVideoElement : HTMLMediaElement {
     [CEReactions, Reflect] attribute unsigned long width;
     [CEReactions, Reflect] attribute unsigned long height;
     readonly attribute unsigned long videoWidth;
     readonly attribute unsigned long videoHeight;
     [CEReactions, Reflect, URL, Measure] attribute DOMString poster;
 
     // Non-standard APIs
     [RuntimeEnabled=PrefixedVideoFullscreen, DeprecateAs=PrefixedVideoSupportsFullscreen] readonly attribute boolean webkitSupportsFullscreen;
     [RuntimeEnabled=PrefixedVideoFullscreen, DeprecateAs=PrefixedVideoDisplayingFullscreen] readonly attribute boolean webkitDisplayingFullscreen;
 
     [RuntimeEnabled=PrefixedVideoFullscreen, DeprecateAs=PrefixedVideoEnterFullscreen, LogActivity, LogAllWorlds] void webkitEnterFullscreen();
     [RuntimeEnabled=PrefixedVideoFullscreen, DeprecateAs=PrefixedVideoExitFullscreen] void webkitExitFullscreen();
 
     // Note the different capitalization of the "S" in FullScreen.
     [RuntimeEnabled=PrefixedVideoFullscreen, DeprecateAs=PrefixedVideoEnterFullScreen, ImplementedAs=webkitEnterFullscreen, LogActivity, LogAllWorlds] void webkitEnterFullScreen();
     [RuntimeEnabled=PrefixedVideoFullscreen, DeprecateAs=PrefixedVideoExitFullScreen, ImplementedAs=webkitExitFullscreen] void webkitExitFullScreen();
 
     // The number of frames that have been decoded and made available for
     // playback.
     [MeasureAs=PrefixedVideoDecodedFrameCount] readonly attribute unsigned long webkitDecodedFrameCount;
 
     // The number of decoded frames that have been dropped by the player
     // for performance reasons during playback.
     [MeasureAs=PrefixedVideoDroppedFrameCount] readonly attribute unsigned long webkitDroppedFrameCount;
 };