Change PaintLayer::m_layoutObject to a reference.

third_party/WebKit/Source/web/tests/LayoutGeometryMapTest.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 88 matching lines @@
   static const LayoutBoxModelObject* getLayoutContainer(
       WebView* webView,
       const WTF::AtomicString& elementId) {
     LayoutBox* rb = getLayoutBox(webView, elementId);
     if (!rb)
       return nullptr;
     PaintLayer* compositingLayer =
         rb->enclosingLayer()->enclosingLayerForPaintInvalidation();
     if (!compositingLayer)
       return nullptr;
-    return compositingLayer->layoutObject();
+    return &compositingLayer->layoutObject();
   }
 
   static const LayoutBoxModelObject* getFrameLayoutContainer(
       const char* frameId,
       WebView* webView,
       const WTF::AtomicString& elementId) {
     LayoutBox* rb = getFrameElement(frameId, webView, elementId);
     if (!rb)
       return nullptr;
     PaintLayer* compositingLayer =
         rb->enclosingLayer()->enclosingLayerForPaintInvalidation();
     if (!compositingLayer)
       return nullptr;
-    return compositingLayer->layoutObject();
+    return &compositingLayer->layoutObject();
   }
 
   static const FloatRect rectFromQuad(const FloatQuad& quad) {
     FloatRect rect;
     rect.setX(std::min(
         quad.p1().x(),
         std::min(quad.p2().x(), std::min(quad.p3().x(), quad.p4().x()))));
     rect.setY(std::min(
         quad.p1().y(),
         std::min(quad.p2().y(), std::min(quad.p3().y(), quad.p4().y()))));
@@ skipping 394 matching lines @@
   EXPECT_EQ(FloatRect(263.0f, 154.0f, 10.0f, 8.0f),
             rectFromQuad(rgm.mapToAncestor(rect, nullptr)));
 
   rgm.pushMappingsToAncestor(floating, span);
   EXPECT_EQ(rect, rectFromQuad(rgm.mapToAncestor(rect, container)));
   EXPECT_EQ(FloatRect(63.0f, 54.0f, 10.0f, 8.0f),
             rectFromQuad(rgm.mapToAncestor(rect, nullptr)));
 }
 
 }  // namespace blink