Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/SVGFilterPainter.h

 // Copyright 2015 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.
 
 #ifndef SVGFilterPainter_h
 #define SVGFilterPainter_h
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/PaintController.h"
 #include "wtf/Allocator.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 class FilterData;
 class LayoutObject;
 class LayoutSVGResourceFilter;
 
 class SVGFilterRecordingContext {
     USING_FAST_MALLOC(SVGFilterRecordingContext);
     WTF_MAKE_NONCOPYABLE(SVGFilterRecordingContext);
 public:
-    explicit SVGFilterRecordingContext(GraphicsContext* initialContext) : m_initialContext(initialContext) { }
+    explicit SVGFilterRecordingContext(GraphicsContext& initialContext) : m_initialContext(initialContext) { }
 
     GraphicsContext* beginContent(FilterData*);
     void endContent(FilterData*);
 
-    GraphicsContext* paintingContext() const { return m_initialContext; }
+    GraphicsContext& paintingContext() const { return m_initialContext; }
 
 private:
     OwnPtr<PaintController> m_paintController;
     OwnPtr<GraphicsContext> m_context;
-    GraphicsContext* m_initialContext;
+    GraphicsContext& m_initialContext;
 };
 
 class SVGFilterPainter {
     STACK_ALLOCATED();
 public:
     SVGFilterPainter(LayoutSVGResourceFilter& filter) : m_filter(filter) { }
 
     // Returns the context that should be used to paint the filter contents, or
     // null if the content should not be recorded.
     GraphicsContext* prepareEffect(const LayoutObject&, SVGFilterRecordingContext&);
     void finishEffect(const LayoutObject&, SVGFilterRecordingContext&);
 
 private:
     LayoutSVGResourceFilter& m_filter;
 };
 
 } // namespace blink
 
 #endif // SVGFilterPainter_h