Move pending async script to the correct resolved document.

Source/core/html/HTMLScriptElement.cpp

Index: Source/core/html/HTMLScriptElement.cpp
diff --git a/Source/core/html/HTMLScriptElement.cpp b/Source/core/html/HTMLScriptElement.cpp
index b95da30566f265e2ee01c80206b1bf2fb71d00ee..d9cbb807932fd94953cdd369c50532709825225c 100644
--- a/Source/core/html/HTMLScriptElement.cpp
+++ b/Source/core/html/HTMLScriptElement.cpp
@@ -73,7 +73,8 @@ void HTMLScriptElement::childrenChanged(const ChildrenChange& change)
 
 void HTMLScriptElement::didMoveToNewDocument(Document& oldDocument)
 {
-    oldDocument.scriptRunner()->movePendingAsyncScript(document().scriptRunner(), m_loader.get());
+    if (RefPtrWillBeRawPtr<Document> contextDocument = document().contextDocument().get())
+        oldDocument.scriptRunner()->movePendingAsyncScript(contextDocument->scriptRunner(), m_loader.get());
     HTMLElement::didMoveToNewDocument(oldDocument);
 }