Oilpan: fix build after r363998.

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

Index: third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp
index 94168ae109b119a24206173229e2de3df6d1952b..1cd367307d48420886c2750c1c294e6e84a0c8f9 100644
--- a/third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp
@@ -49,13 +49,6 @@ static bool invalidatePaintOfScrollControlIfNeeded(const LayoutRect& newPaintInv
     return false;
 }
 
-struct ScrollbarPaintInvalidationData {
-    Scrollbar* scrollbar;
-    GraphicsLayer* graphicsLayer;
-    LayoutRect& previousPaintInvalidatioRect;
-
-};
-
 static void invalidatePaintOfScrollbarIfNeeded(Scrollbar* scrollbar, GraphicsLayer* graphicsLayer, bool& previouslyWasOverlay, LayoutRect& previousPaintInvalidationRect, bool needsPaintInvalidationArg, LayoutBox& box, const PaintInvalidationState& paintInvalidationState, const LayoutBoxModelObject& paintInvalidationContainer)
 {
     bool isOverlay = scrollbar && scrollbar->isOverlayScrollbar();