Delete a bunch of noop paint invalidation code.

sky/engine/platform/scroll/ScrollableArea.cpp

Index: sky/engine/platform/scroll/ScrollableArea.cpp
diff --git a/sky/engine/platform/scroll/ScrollableArea.cpp b/sky/engine/platform/scroll/ScrollableArea.cpp
index dff4cd9342f2975d5253025004aa0e1cbdb14ef0..a4db72862d238dad26de5bb189e1d14eac0e9fd6 100644
--- a/sky/engine/platform/scroll/ScrollableArea.cpp
+++ b/sky/engine/platform/scroll/ScrollableArea.cpp
@@ -47,7 +47,6 @@ namespace blink {
 
 struct SameSizeAsScrollableArea {
     virtual ~SameSizeAsScrollableArea();
-    IntRect scrollbarDamage[2];
     void* pointer;
     unsigned bitfields : 16;
     IntPoint origin;
@@ -173,13 +172,6 @@ void ScrollableArea::scrollPositionChanged(const IntPoint& position)
         if (horizontalScrollbar->isOverlayScrollbar()) {
             if (!verticalScrollbar)
                 horizontalScrollbar->invalidate();
-            else {
-                // If there is both a horizontalScrollbar and a verticalScrollbar,
-                // then we must also invalidate the corner between them.
-                IntRect boundsAndCorner = horizontalScrollbar->boundsRect();
-                boundsAndCorner.setWidth(boundsAndCorner.width() + verticalScrollbar->width());
-                horizontalScrollbar->invalidateRect(boundsAndCorner);
-            }
         }
     }
     if (verticalScrollbar) {
@@ -319,11 +311,6 @@ void ScrollableArea::setScrollbarOverlayStyle(ScrollbarOverlayStyle overlayStyle
     }
 }
 
-void ScrollableArea::invalidateScrollbar(Scrollbar* scrollbar, const IntRect& rect)
-{
-    invalidateScrollbarRect(scrollbar, rect);
-}
-
 bool ScrollableArea::scheduleAnimation()
 {
     WTF_LOG(ScriptedAnimationController, "ScrollableArea::scheduleAnimation: window = %d",