Remove MediaQueryList listener from removed HTMLSourceElement.

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

Index: third_party/WebKit/Source/core/html/HTMLImageElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLImageElement.cpp b/third_party/WebKit/Source/core/html/HTMLImageElement.cpp
index 25baa498a4e77f62148abf6594c18cb95eb9871e..5adb52b9e27d3ad715450455ddeb87d6fb91cf44 100644
--- a/third_party/WebKit/Source/core/html/HTMLImageElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLImageElement.cpp
@@ -399,8 +399,11 @@ 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);
 }