Remove assumption that null containerForRepaint assumes RenderView

Source/core/rendering/RenderLayerScrollableArea.cpp

Index: Source/core/rendering/RenderLayerScrollableArea.cpp
diff --git a/Source/core/rendering/RenderLayerScrollableArea.cpp b/Source/core/rendering/RenderLayerScrollableArea.cpp
index 3e96139bd8e833d2ee5d60f9403dd430b7dd0ae4..e7ebf4e52683f525e8f8e664a11341863fd7526e 100644
--- a/Source/core/rendering/RenderLayerScrollableArea.cpp
+++ b/Source/core/rendering/RenderLayerScrollableArea.cpp
@@ -381,8 +381,7 @@ void RenderLayerScrollableArea::setScrollOffset(const IntPoint& newScrollOffset)
     else
         quadForFakeMouseMoveEvent = FloatQuad(layer()->repainter().repaintRect());
 
-    if (repaintContainer)
-        quadForFakeMouseMoveEvent = repaintContainer->localToAbsoluteQuad(quadForFakeMouseMoveEvent);
+    quadForFakeMouseMoveEvent = repaintContainer->localToAbsoluteQuad(quadForFakeMouseMoveEvent);
     frame->eventHandler().dispatchFakeMouseMoveEventSoonInQuad(quadForFakeMouseMoveEvent);
 
     bool requiresRepaint = true;