Revert of Use element id's for animations

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

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index 4c8268878c09e5ea795c22d76dc0c4263036543e..58a4ad8b87a94cc5c8480dd6930a525bc0624662 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -45,7 +45,6 @@
 
 #include "core/css/PseudoStyleRequest.h"
 #include "core/dom/AXObjectCache.h"
-#include "core/dom/DOMNodeIds.h"
 #include "core/dom/Node.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
@@ -1642,11 +1641,6 @@
     scrollbar = nullptr;
 }
 
-uint64_t PaintLayerScrollableArea::id() const
-{
-    return DOMNodeIds::idForNode(box().node());
-}
-
 DEFINE_TRACE(PaintLayerScrollableArea::ScrollbarManager)
 {
     visitor->trace(m_scrollableArea);