Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/ClipScope.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 "config.h"
 
 #include "core/paint/ClipScope.h"
 
 #include "platform/geometry/LayoutRect.h"
 
 namespace blink {
 
 ClipScope::~ClipScope()
 {
     for (int i = 0; i < m_clipCount; i++) {
-        m_context->restore();
+        m_context.restore();
     }
 }
 
 void ClipScope::clip(const LayoutRect& clipRect, SkRegion::Op operation)
 {
-    m_context->save();
-    m_context->clipRect(pixelSnappedIntRect(clipRect), NotAntiAliased, operation);
+    m_context.save();
+    m_context.clipRect(pixelSnappedIntRect(clipRect), NotAntiAliased, operation);
     m_clipCount++;
 }
 
 } // namespace blink