Make CustomElementSchedular static

Source/core/dom/custom/CustomElementScheduler.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 44 matching lines @@
 
     static void scheduleCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtrWillBeRawPtr<Element>, CustomElementLifecycleCallbacks::CallbackType);
     static void scheduleAttributeChangedCallback(PassRefPtr<CustomElementLifecycleCallbacks>, PassRefPtrWillBeRawPtr<Element>, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue);
 
     static void resolveOrScheduleResolution(PassRefPtrWillBeRawPtr<CustomElementRegistrationContext>, PassRefPtrWillBeRawPtr<Element>, const CustomElementDescriptor&);
     static CustomElementMicrotaskImportStep* scheduleImport(HTMLImportChild*);
 
     static void microtaskDispatcherDidFinish();
     static void callbackDispatcherDidFinish();
 
-    void trace(Visitor*);
-
 private:
     CustomElementScheduler() { }
 
-    static CustomElementScheduler& instance();
     static void enqueueMicrotaskStep(Document&, PassOwnPtrWillBeRawPtr<CustomElementMicrotaskStep>, bool importIsSync = true);
-
-    CustomElementCallbackQueue& ensureCallbackQueue(PassRefPtrWillBeRawPtr<Element>);
-    CustomElementCallbackQueue& schedule(PassRefPtrWillBeRawPtr<Element>);
-
-    // FIXME: Consider moving the element's callback queue to
-    // ElementRareData. Then the scheduler can become completely
-    // static.
-    void clearElementCallbackQueueMap();
-
-    // The element -> callback queue map is populated by the scheduler
-    // and owns the lifetimes of the CustomElementCallbackQueues.
-    typedef WillBeHeapHashMap<RawPtrWillBeMember<Element>, OwnPtrWillBeMember<CustomElementCallbackQueue> > ElementCallbackQueueMap;
-    ElementCallbackQueueMap m_elementCallbackQueueMap;
 };
 
 }
 
 #endif // CustomElementScheduler_h