Delete some dead code in PaintLayer

Change-Id: If8f9a3498573cfd17e21dc8d0819a06c58579dd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208099
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771213}

third_party/blink/renderer/core/paint/paint_layer.cc

@@ -581,32 +581,6 @@ void PaintLayer::MapPointInPaintInvalidationContainerToBacking(
   point -= PhysicalOffset(squashing_layer->GetOffsetFromTransformNode());
 }
 
-void PaintLayer::MapQuadInPaintInvalidationContainerToBacking(
-    const LayoutBoxModelObject& paint_invalidation_container,
-    FloatQuad& quad) {
-  PaintLayer* paint_invalidation_layer = paint_invalidation_container.Layer();
-  if (!paint_invalidation_layer->GroupedMapping())
-    return;
-
-  GraphicsLayer* squashing_layer =
-      paint_invalidation_layer->GroupedMapping()->SquashingLayer(
-          *paint_invalidation_layer);
-
-  PropertyTreeState source_state =
-      paint_invalidation_container.FirstFragment().LocalBorderBoxProperties();
-  PropertyTreeState dest_state = squashing_layer->GetPropertyTreeState();
-
-  // Move the rect into the source_state transform space, map to dest_state
-  // transform space, then move into squashing layer state.
-  quad.Move(
-      FloatSize(paint_invalidation_container.FirstFragment().PaintOffset()));
-  GeometryMapper::SourceToDestinationProjection(source_state.Transform(),
-                                                dest_state.Transform())
-      .MapQuad(quad);
-  quad.Move(
-      -ToFloatSize(FloatPoint(squashing_layer->GetOffsetFromTransformNode())));
-}
-
 void PaintLayer::DirtyVisibleContentStatus() {
   MarkAncestorChainForFlagsUpdate();
   // Non-self-painting layers paint into their ancestor layer, and count as part

third_party/blink/renderer/core/paint/paint_layer.h

@@ -613,9 +613,6 @@ class CORE_EXPORT PaintLayer : public DisplayItemClient {
   static void MapPointInPaintInvalidationContainerToBacking(
       const LayoutBoxModelObject& paint_invalidation_container,
       PhysicalOffset&);
-  static void MapQuadInPaintInvalidationContainerToBacking(
-      const LayoutBoxModelObject& paint_invalidation_container,
-      FloatQuad&);
 
   bool PaintsWithTransparency(GlobalPaintFlags global_paint_flags) const {
     return IsTransparent() && !PaintsIntoOwnBacking(global_paint_flags);