Change PaintLayer::m_layoutObject to a reference.

third_party/WebKit/Source/core/paint/LayerClipRecorderTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/LayerClipRecorder.h"
 
 #include "core/layout/LayoutView.h"
 #include "core/layout/compositing/PaintLayerCompositor.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintControllerPaintTest.h"
@@ skipping 13 matching lines @@
     enableCompositing();
   }
 };
 
 void drawEmptyClip(GraphicsContext& context,
                    LayoutView& layoutView,
                    PaintPhase phase) {
   LayoutRect rect(1, 1, 9, 9);
   ClipRect clipRect(rect);
   LayerClipRecorder LayerClipRecorder(
-      context, *layoutView.compositor()->rootLayer()->layoutObject(),
+      context, layoutView.compositor()->rootLayer()->layoutObject(),
       DisplayItem::kClipLayerForeground, clipRect, 0, LayoutPoint(),
       PaintLayerFlags());
 }
 
 void drawRectInClip(GraphicsContext& context,
                     LayoutView& layoutView,
                     PaintPhase phase,
                     const LayoutRect& bound) {
   IntRect rect(1, 1, 9, 9);
   ClipRect clipRect((LayoutRect(rect)));
   LayerClipRecorder LayerClipRecorder(
-      context, *layoutView.compositor()->rootLayer()->layoutObject(),
+      context, layoutView.compositor()->rootLayer()->layoutObject(),
       DisplayItem::kClipLayerForeground, clipRect, 0, LayoutPoint(),
       PaintLayerFlags());
   if (!LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(
           context, layoutView, phase)) {
     LayoutObjectDrawingRecorder drawingRecorder(context, layoutView, phase,
                                                 bound);
     context.drawRect(rect);
   }
 }
 
@@ skipping 19 matching lines @@
   GraphicsContext context(rootPaintController());
   EXPECT_EQ((size_t)0, rootPaintController().getDisplayItemList().size());
 
   drawEmptyClip(context, layoutView(), PaintPhaseForeground);
   rootPaintController().commitNewDisplayItems();
   EXPECT_EQ((size_t)0, rootPaintController().getDisplayItemList().size());
 }
 
 }  // namespace
 }  // namespace blink