Custom Elements: Encapsulates Async and Sync Queues into one class.

Source/core/dom/custom/CustomElementMicrotaskDispatcher.h

Index: Source/core/dom/custom/CustomElementMicrotaskDispatcher.h
diff --git a/Source/core/dom/custom/CustomElementMicrotaskDispatcher.h b/Source/core/dom/custom/CustomElementMicrotaskDispatcher.h
index ae54007ba12ff36e6d829b75bac539ad9b8ade03..961074fd2427a1af33e64161b5349962e7aae166 100644
--- a/Source/core/dom/custom/CustomElementMicrotaskDispatcher.h
+++ b/Source/core/dom/custom/CustomElementMicrotaskDispatcher.h
@@ -12,11 +12,10 @@
 
 namespace WebCore {
 
-class CustomElementAsyncImportMicrotaskQueue;
 class CustomElementCallbackQueue;
 class CustomElementMicrotaskImportStep;
-class CustomElementMicrotaskQueue;
 class CustomElementMicrotaskStep;
+class CustomElementMicrotaskStepDispatcher;
 class HTMLImportLoader;
 
 class CustomElementMicrotaskDispatcher FINAL : public NoBaseWillBeGarbageCollected<CustomElementMicrotaskDispatcher> {
@@ -58,8 +57,7 @@ private:
         DispatchingCallbacks
     } m_phase;
 
-    RefPtrWillBeMember<CustomElementMicrotaskQueue> m_resolutionAndImports;
-    RefPtrWillBeMember<CustomElementAsyncImportMicrotaskQueue> m_asyncImports;
+    RefPtrWillBeMember<CustomElementMicrotaskStepDispatcher> m_steps;
     WillBeHeapVector<RawPtrWillBeMember<CustomElementCallbackQueue> > m_elements;
 };