Revert of Expose scroll customization for touch to JS (behind REF).

Source/core/page/scrolling/ScrollCustomizationCallbacks.h

Index: Source/core/page/scrolling/ScrollCustomizationCallbacks.h
diff --git a/Source/core/page/scrolling/ScrollCustomizationCallbacks.h b/Source/core/page/scrolling/ScrollCustomizationCallbacks.h
deleted file mode 100644
index 9c137a5305a296fe70461a5aebd1beb86f913392..0000000000000000000000000000000000000000
--- a/Source/core/page/scrolling/ScrollCustomizationCallbacks.h
+++ /dev/null
@@ -1,45 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ScrollCustomizationCallbacks_h
-#define ScrollCustomizationCallbacks_h
-
-#include "core/CoreExport.h"
-#include "core/dom/Element.h"
-#include "platform/heap/Handle.h"
-#include "wtf/HashMap.h"
-
-namespace blink {
-
-class ScrollStateCallback;
-
-class CORE_EXPORT ScrollCustomizationCallbacks : public GarbageCollected<ScrollCustomizationCallbacks> {
-    WTF_MAKE_NONCOPYABLE(ScrollCustomizationCallbacks);
-
-public:
-    ScrollCustomizationCallbacks() {}
-    void setDistributeScroll(Element*, ScrollStateCallback*);
-    ScrollStateCallback* getDistributeScroll(Element*);
-    void setApplyScroll(Element*, ScrollStateCallback*);
-    ScrollStateCallback* getApplyScroll(Element*);
-
-    DEFINE_INLINE_TRACE()
-    {
-        visitor->trace(m_applyScrollCallbacks);
-        visitor->trace(m_distributeScrollCallbacks);
-    };
-
-#if !ENABLE(OILPAN)
-    void removeCallbacksForElement(Element*);
-#endif
-
-private:
-    using ScrollStateCallbackList = HeapHashMap<RawPtrWillBeWeakMember<Element>, Member<ScrollStateCallback>>;
-    ScrollStateCallbackList m_applyScrollCallbacks;
-    ScrollStateCallbackList m_distributeScrollCallbacks;
-};
-
-} // namespace blink
-
-#endif // ScrollCustomizationCallbacks_h