Change PaintLayer::m_layoutObject to a reference.

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

Index: third_party/WebKit/Source/web/tests/LayoutGeometryMapTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/LayoutGeometryMapTest.cpp b/third_party/WebKit/Source/web/tests/LayoutGeometryMapTest.cpp
index 5afcad909a2587d8ec75cec6039c6c67d4ccac32..95dcee0101049b9e5ce1d0ced0e36578c9c33b4d 100644
--- a/third_party/WebKit/Source/web/tests/LayoutGeometryMapTest.cpp
+++ b/third_party/WebKit/Source/web/tests/LayoutGeometryMapTest.cpp
@@ -106,7 +106,7 @@ class LayoutGeometryMapTest
         rb->enclosingLayer()->enclosingLayerForPaintInvalidation();
     if (!compositingLayer)
       return nullptr;
-    return compositingLayer->layoutObject();
+    return &compositingLayer->layoutObject();
   }
 
   static const LayoutBoxModelObject* getFrameLayoutContainer(
@@ -120,7 +120,7 @@ class LayoutGeometryMapTest
         rb->enclosingLayer()->enclosingLayerForPaintInvalidation();
     if (!compositingLayer)
       return nullptr;
-    return compositingLayer->layoutObject();
+    return &compositingLayer->layoutObject();
   }
 
   static const FloatRect rectFromQuad(const FloatQuad& quad) {