remove memoryinstrumentation

Source/core/platform/ScrollableArea.cpp

Index: Source/core/platform/ScrollableArea.cpp
diff --git a/Source/core/platform/ScrollableArea.cpp b/Source/core/platform/ScrollableArea.cpp
index 7c2000283306def37265154764064cf3900bced4..93bbec4d30a2fe9f6ebe39650e15bd4447575684 100644
--- a/Source/core/platform/ScrollableArea.cpp
+++ b/Source/core/platform/ScrollableArea.cpp
@@ -35,7 +35,6 @@
 #include "GraphicsContext.h"
 #include "GraphicsLayer.h"
 #include "FloatPoint.h"
-#include "PlatformMemoryInstrumentation.h"
 #include "PlatformWheelEvent.h"
 #include "ScrollAnimator.h"
 #include "ScrollbarTheme.h"
@@ -406,10 +405,4 @@ IntPoint ScrollableArea::clampScrollPosition(const IntPoint& scrollPosition) con
     return scrollPosition.shrunkTo(maximumScrollPosition()).expandedTo(minimumScrollPosition());
 }
 
-void ScrollableArea::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
-{
-    MemoryClassInfo info(memoryObjectInfo, this);
-    info.addMember(m_scrollAnimator, "scrollAnimator");
-}
-
 } // namespace WebCore