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 8899ff7d3c8558d44d2e4ced8b5ed284d48654b6..5ddce83187c7f4ec075b2e1ddeb605d9c8829707 100644
--- a/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
@@ -1327,13 +1327,18 @@ 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)