Revert of Use element id's for animations

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 395 matching lines @@
     bool shouldRebuildVerticalScrollbarLayer() const { return m_rebuildVerticalScrollbarLayer; }
     void resetRebuildScrollbarLayerFlags();
 
     bool needsScrollPositionClamp() const { return m_needsScrollPositionClamp; }
     void setNeedsScrollPositionClamp(bool val) { m_needsScrollPositionClamp = val; }
 
     StickyConstraintsMap& stickyConstraintsMap() { return ensureRareData().m_stickyConstraintsMap; }
     void invalidateAllStickyConstraints();
     void invalidateStickyConstraintsFor(PaintLayer*, bool needsCompositingUpdate = true);
 
-    uint64_t id() const;
-
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit PaintLayerScrollableArea(PaintLayer&);
 
     bool hasHorizontalOverflow() const;
     bool hasVerticalOverflow() const;
     bool hasScrollableHorizontalOverflow() const;
     bool hasScrollableVerticalOverflow() const;
     bool visualViewportSuppliesScrollbars() const;
@@ skipping 90 matching lines @@
 #endif
 };
 
 DEFINE_TYPE_CASTS(PaintLayerScrollableArea, ScrollableArea, scrollableArea,
     scrollableArea->isPaintLayerScrollableArea(),
     scrollableArea.isPaintLayerScrollableArea());
 
 } // namespace blink
 
 #endif // LayerScrollableArea_h