Make custom elements work in HTML imports

third_party/WebKit/Source/core/dom/custom/CustomElement.cpp

Index: third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp b/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
index f5d1b2084259d210e062bf6553be983a8d4a5af4..2f6f6bf2f21b12d2ecf89ea0bd169ebb4c49c894 100644
--- a/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElement.cpp
@@ -24,9 +24,10 @@ CustomElementsRegistry* CustomElement::registry(const Element& element)
 {
     return registry(element.document());
 }
+
 CustomElementsRegistry* CustomElement::registry(const Document& document)
 {
-    if (LocalDOMWindow* window = document.domWindow())
+    if (LocalDOMWindow* window = document.executingWindow())

[kochi, 2016/08/22 16:10:21]

This was necessary to exclude cases when detached document is passed to this
function.

         return window->customElements();
     return nullptr;
 }