Use refs for GraphicsContext

third_party/WebKit/Source/platform/scroll/ScrollbarThemeMacOverlayAPI.mm

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 130 matching lines @@
 void ScrollbarThemeMacOverlayAPI::paintTrackBackground(GraphicsContext& context, const ScrollbarThemeClient& scrollbar, const IntRect& rect) {
     if (DrawingRecorder::useCachedDrawingIfPossible(context, scrollbar, DisplayItem::ScrollbarTrackBackground))
         return;
 
     DrawingRecorder recorder(context, scrollbar, DisplayItem::ScrollbarTrackBackground, rect);
 
     ASSERT(isOverlayAPIAvailable());
 
     GraphicsContextStateSaver stateSaver(context);
     context.translate(rect.x(), rect.y());
-    LocalCurrentGraphicsContext localContext(&context, IntRect(IntPoint(), rect.size()));
+    LocalCurrentGraphicsContext localContext(context, IntRect(IntPoint(), rect.size()));
 
     CGRect frameRect = scrollbar.frameRect();
     ScrollbarPainter scrollbarPainter = painterForScrollbar(scrollbar);
     [scrollbarPainter setEnabled:scrollbar.enabled()];
     [scrollbarPainter setBoundsSize: NSSizeFromCGSize(frameRect.size)];
     NSRect trackRect = NSMakeRect(0, 0, frameRect.size.width, frameRect.size.height);
     [scrollbarPainter drawKnobSlotInRect:trackRect highlight:NO];
 }
 
 void ScrollbarThemeMacOverlayAPI::paintThumb(GraphicsContext& context, const ScrollbarThemeClient& scrollbar, const IntRect& rect) {
     if (DrawingRecorder::useCachedDrawingIfPossible(context, scrollbar, DisplayItem::ScrollbarThumb))
         return;
 
     // Expand dirty rect to allow for scroll thumb anti-aliasing in minimum thumb size case.
     IntRect dirtyRect = IntRect(rect);
     dirtyRect.inflate(1);
     DrawingRecorder recorder(context, scrollbar, DisplayItem::ScrollbarThumb, dirtyRect);
 
     ASSERT(isOverlayAPIAvailable());
 
     GraphicsContextStateSaver stateSaver(context);
     context.translate(rect.x(), rect.y());
-    LocalCurrentGraphicsContext localContext(&context, IntRect(IntPoint(), rect.size()));
+    LocalCurrentGraphicsContext localContext(context, IntRect(IntPoint(), rect.size()));
 
     ScrollbarPainter scrollbarPainter = painterForScrollbar(scrollbar);
     [scrollbarPainter setEnabled:scrollbar.enabled()];
     [scrollbarPainter setBoundsSize:NSSizeFromCGSize(rect.size())];
     [scrollbarPainter setDoubleValue:0];
     [scrollbarPainter setKnobProportion:1];
 
     CGFloat oldKnobAlpha = [scrollbarPainter knobAlpha];
     [scrollbarPainter setKnobAlpha:1];
 
@@ skipping 85 matching lines @@
     [painterForScrollbar(scrollbar) setEnabled:scrollbar.enabled()];
 }
 
 float ScrollbarThemeMacOverlayAPI::thumbOpacity(const ScrollbarThemeClient& scrollbar) const {
     ScrollbarPainter scrollbarPainter = painterForScrollbar(scrollbar);
     return [scrollbarPainter knobAlpha];
 }
 
 } // namespace blink