Use refs for GraphicsContext

third_party/WebKit/Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 692 matching lines @@
     LayoutView* view = m_frame->document()->layoutView();
     if (m_previousCaretNode && (shouldRepaintCaret(*m_previousCaretNode) || shouldRepaintCaret(view)))
         invalidateLocalCaretRect(m_previousCaretNode.get(), m_previousCaretRect);
     if (newNode && (shouldRepaintCaret(*newNode) || shouldRepaintCaret(view)))
         invalidateLocalCaretRect(newNode, newRect);
     m_previousCaretNode = newNode;
     m_previousCaretRect = newRect;
     m_previousCaretVisibility = caretVisibility();
 }
 
-void FrameSelection::paintCaret(GraphicsContext* context, const LayoutPoint& paintOffset)
+void FrameSelection::paintCaret(GraphicsContext& context, const LayoutPoint& paintOffset)
 {
     if (selection().isCaret() && m_shouldPaintCaret) {
         updateCaretRect(PositionWithAffinity(selection().start(), selection().affinity()));
         CaretBase::paintCaret(selection().start().anchorNode(), context, paintOffset);
     }
 }
 
 template <typename Strategy>
 bool FrameSelection::containsAlgorithm(const LayoutPoint& point)
 {
@@ skipping 682 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif