Revert of ObjectPainter::paintAsStackingContext()

third_party/WebKit/Source/core/paint/ObjectPainter.h

Index: third_party/WebKit/Source/core/paint/ObjectPainter.h
diff --git a/third_party/WebKit/Source/core/paint/ObjectPainter.h b/third_party/WebKit/Source/core/paint/ObjectPainter.h
index 539ebb87b4fae227743d02befc917b8c9783e207..163a3c0f9ce7fb6159d2894777c11f719977b1d0 100644
--- a/third_party/WebKit/Source/core/paint/ObjectPainter.h
+++ b/third_party/WebKit/Source/core/paint/ObjectPainter.h
@@ -31,18 +31,6 @@
 
     static void drawLineForBoxSide(GraphicsContext&, int x1, int y1, int x2, int y2, BoxSide, Color, EBorderStyle, int adjbw1, int adjbw2, bool antialias = false);
 
-    // Paints the object atomically as if it created a new stacking context, for:
-    // - inline blocks, inline tables, inline-level replaced elements (Section 7.2.1.4 in
-    //   http://www.w3.org/TR/CSS2/zindex.html#painting-order),
-    // - non-positioned floating objects (Section 5 in http://www.w3.org/TR/CSS2/zindex.html#painting-order),
-    // - flex items (http://www.w3.org/TR/css-flexbox-1/#painting),
-    // - grid items (http://www.w3.org/TR/css-grid-1/#z-order),
-    // - custom scrollbar parts.
-    // It is expected that the caller will call this function independent of the value of paintInfo.phase,
-    // and this function will do atomic paint (for PaintPhaseForeground), normal paint (for PaintPhaseSelection
-    // and PaintPhaseTextClip) or nothing (other paint phases) according to paintInfo.phase.
-    void paintAsPseudoStackingContext(const PaintInfo&, const LayoutPoint& paintOffset);
-
 private:
     static void drawDashedOrDottedBoxSide(GraphicsContext&, int x1, int y1, int x2, int y2,
         BoxSide, Color, int thickness, EBorderStyle, bool antialias);