Make Custom Elements V1 work in HTML imports documents

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

Index: third_party/WebKit/Source/core/dom/custom/CEReactionsScope.cpp
diff --git a/third_party/WebKit/Source/core/dom/custom/CEReactionsScope.cpp b/third_party/WebKit/Source/core/dom/custom/CEReactionsScope.cpp
index dec7331dac87041e08f26ca8de954c0ea88d66d1..1a204b4166c02a33a9009e2cd6ec2543059f03c3 100644
--- a/third_party/WebKit/Source/core/dom/custom/CEReactionsScope.cpp
+++ b/third_party/WebKit/Source/core/dom/custom/CEReactionsScope.cpp
@@ -6,6 +6,7 @@
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
+#include "core/dom/custom/CustomElement.h"
 #include "core/dom/custom/CustomElementReactionStack.h"
 #include "core/frame/FrameHost.h"
 
@@ -18,10 +19,10 @@ void CEReactionsScope::enqueueToCurrentQueue(
     CustomElementReaction* reaction)
 {
     if (!m_frameHost.get()) {
-        m_frameHost = element->document().frameHost();
+        m_frameHost = CustomElement::contextFrameHost(*element);
         m_frameHost->customElementReactionStack().push();
     } else {
-        DCHECK_EQ(m_frameHost, element->document().frameHost());
+        DCHECK_EQ(m_frameHost, CustomElement::contextFrameHost(*element));
     }
     m_frameHost->customElementReactionStack().enqueueToCurrentQueue(
         element, reaction);