Fix 'will execute script' condition for creating custom elements in imports

third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 744 matching lines @@
     if (isHTMLTemplateElement(*currentNode()))
         return toHTMLTemplateElement(currentElement())->content()->document();
     return currentNode()->document();
 }
 
 // "look up a custom element definition" for a token
 // https://html.spec.whatwg.org/#look-up-a-custom-element-definition
 CustomElementDefinition* HTMLConstructionSite::lookUpCustomElementDefinition(Document& document, AtomicHTMLToken* token)
 {
     // "2. If document does not have a browsing context, return null."
-    LocalDOMWindow* window = document.domWindow();
+    LocalDOMWindow* window = document.executingWindow();
     if (!window)
         return nullptr;
 
     // "3. Let registry be document's browsing context's Window's
     // CustomElementRegistry object."
     CustomElementRegistry* registry = window->maybeCustomElements();
     if (!registry)
         return nullptr;
 
     const AtomicString& localName = token->name();
@@ skipping 203 matching lines @@
     queueTask(task);
 }
 
 DEFINE_TRACE(HTMLConstructionSite::PendingText)
 {
     visitor->trace(parent);
     visitor->trace(nextChild);
 }
 
 } // namespace blink