Factor painting code from RenderBlock into BlockPainter.

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index a271cdc5a84f06eecfd1fbe26a39437d8a30078d..44f1bc5d72e6ec6d790d3ca5b475b9b2bfc24585 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -4313,17 +4313,6 @@ LayoutRect RenderBox::noOverflowRect() const
     return rect;
 }
 
-LayoutRect RenderBox::overflowRectForPaintRejection() const
-{
-    LayoutRect overflowRect = visualOverflowRect();
-    if (!m_overflow || !usesCompositedScrolling())
-        return overflowRect;
-
-    overflowRect.unite(layoutOverflowRect());
-    overflowRect.move(-scrolledContentOffset());
-    return overflowRect;
-}
-
 LayoutUnit RenderBox::offsetLeft() const
 {
     return adjustedPositionRelativeToOffsetParent(topLeftLocation()).x();