Reset mode on ancestors when a fullscreen node is removed.

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 95d6824d5e7e8884895744412924fe18f00ce21b..8c4e5ddabca31756571db8141a69c1e9e6509e88 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1371,8 +1371,13 @@ void Element::removedFrom(ContainerNode* insertionPoint)
 
     ASSERT(!hasRareData() || !elementRareData()->hasPseudoElements());
 
-    if (containsFullScreenElement())
+    if (Fullscreen::isActiveFullScreenElement(*this)) {
         setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(false);
+        if (insertionPoint->isElementNode()) {
+            toElement(insertionPoint)->setContainsFullScreenElement(false);
+            toElement(insertionPoint)->setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(false);
+        }
+    }
 
     if (Fullscreen* fullscreen = Fullscreen::fromIfExists(document()))
         fullscreen->elementRemoved(*this);