Remove MediaQueryList listener from removed HTMLSourceElement.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 381 matching lines @@
     if ((insertionPoint->isConnected() && !imageLoader().image()) || imageWasModified)
         imageLoader().updateFromElement(ImageLoader::UpdateNormal, m_referrerPolicy);
 
     return HTMLElement::insertedInto(insertionPoint);
 }
 
 void HTMLImageElement::removedFrom(ContainerNode* insertionPoint)
 {
     if (!m_form || NodeTraversal::highestAncestorOrSelf(*m_form.get()) != NodeTraversal::highestAncestorOrSelf(*this))
         resetFormOwner();
-    if (m_listener)
+    if (m_listener) {
         document().mediaQueryMatcher().removeViewportListener(m_listener);
+        if (m_source)
+            m_source->notifyImgSiblingRemoved();

[cbiesinger, 2016/08/17 19:32:05]

What about the <source> elements that were not chosen? Shouldn't they also
remove their listeners?

And... when an <img> element appears again, don't they need to re-add their
listeners?

[Yoav Weiss, 2016/08/30 07:37:07]

Good call. I'll add that.

+    }
     HTMLElement::removedFrom(insertionPoint);
 }
 
 int HTMLImageElement::width()
 {
     if (inActiveDocument())
         document().updateStyleAndLayoutIgnorePendingStylesheets();
 
     if (!layoutObject()) {
         // check the attribute first for an explicit pixel value
@@ skipping 413 matching lines @@
 {
     ImageResource* image = cachedImage();
     if (!image)
         return IntSize();
     LayoutSize lSize = image->imageSize(LayoutObject::shouldRespectImageOrientation(layoutObject()), 1.0f);
     ASSERT(lSize.fraction().isZero());
     return IntSize(lSize.width(), lSize.height());
 }
 
 } // namespace blink