Delete unused paint invalidation function.

sky/engine/core/rendering/RenderObject.cpp

Index: sky/engine/core/rendering/RenderObject.cpp
diff --git a/sky/engine/core/rendering/RenderObject.cpp b/sky/engine/core/rendering/RenderObject.cpp
index 67626e7434aef20a824d508c279455c47dfe8b03..66c11ec47436f9713b90ebb890e31036a45c121a 100644
--- a/sky/engine/core/rendering/RenderObject.cpp
+++ b/sky/engine/core/rendering/RenderObject.cpp
@@ -2066,14 +2066,6 @@ bool RenderObject::canUpdateSelectionOnRootLineBoxes()
     return containingBlock ? !containingBlock->needsLayout() : false;
 }
 
-// Returns the smallest rectangle enclosing all of the painted content
-// respecting clipping, masking, filters, opacity, stroke-width and markers
-FloatRect RenderObject::paintInvalidationRectInLocalCoordinates() const
-{
-    ASSERT_NOT_REACHED();
-    return FloatRect();
-}
-
 bool RenderObject::nodeAtFloatPoint(const HitTestRequest&, HitTestResult&, const FloatPoint&, HitTestAction)
 {
     ASSERT_NOT_REACHED();