Make CustomElementsRegistry lazily initialize script state.

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

Index: third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp b/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
index d5aff08f188620899017ecf54c28193de8f0e6b0..bbd13d770af3152a9f1097581f4829a5f20709f6 100644
--- a/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
@@ -1331,13 +1331,18 @@ void LocalDOMWindow::cancelIdleCallback(int id)
         document->cancelIdleCallback(id);
 }
 
-CustomElementsRegistry* LocalDOMWindow::customElements(ScriptState* scriptState) const
+CustomElementsRegistry* LocalDOMWindow::customElementsForBindings(ScriptState* scriptState) const
 {
     if (!scriptState->world().isMainWorld())
         return nullptr;
+    return &customElements();
+}
+
+CustomElementsRegistry& LocalDOMWindow::customElements() const
+{
     if (!m_customElements)
-        m_customElements = CustomElementsRegistry::create(scriptState, document()->registrationContext());
-    return m_customElements.get();
+        m_customElements = CustomElementsRegistry::create(document()->registrationContext());
+    return *m_customElements.get();
 }
 
 void LocalDOMWindow::addedEventListener(const AtomicString& eventType, RegisteredEventListener& registeredListener)