Remove document.rootScroller compositing clipping effects.

third_party/WebKit/Source/core/page/scrolling/TopDocumentRootScrollerController.h

 // Copyright 2016 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 TopDocumentRootScrollerController_h
 #define TopDocumentRootScrollerController_h
 
 #include "core/CoreExport.h"
 #include "core/page/scrolling/RootScrollerController.h"
 #include "platform/geometry/IntSize.h"
@@ skipping 75 matching lines @@
   // the iframe to find its effective root scroller.
   Element* findGlobalRootScrollerElement();
 
   // Should be called to ensure the correct element is currently set as the
   // global root scroller and that all appropriate state changes are made if
   // it changes.
   void recomputeGlobalRootScroller();
 
   Document* topDocument() const;
 
-  void setNeedsCompositingInputsUpdateOnGlobalRootScroller();
-
   // The apply-scroll callback that moves browser controls and produces
   // overscroll effects. This class makes sure this callback is set on the
   // appropriate root scroller element.
   Member<ViewportScrollCallback> m_viewportApplyScroll;
 
   // The page level root scroller. i.e. The actual element for which
   // scrolling should move browser controls and produce overscroll glow. Once an
   // m_viewportApplyScroll has been created, it will always be set on this
   // Element.
   WeakMember<Element> m_globalRootScroller;
 
   Member<Page> m_page;
 };
 
 }  // namespace blink
 
 #endif  // RootScrollerController_h