Use refs for non-null GraphicsContext, Scrollbar, etc. in scrollbar related code

third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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.
@@ skipping 298 matching lines @@
         // We can only draw the entire frame, clipped to the rect we want. So compute where the top left
         // of the image would be if we were drawing without clipping, and translate accordingly.
         FloatSize scale(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height());
         FloatSize topLeftOffset(srcRect.location().x() * scale.width(), srcRect.location().y() * scale.height());
         FloatPoint destOffset = dstRect.location() - topLeftOffset;
         AffineTransform transform = AffineTransform::translation(destOffset.x(), destOffset.y());
         transform.scale(scale.width(), scale.height());
         TransformRecorder transformRecorder(imagePicture.context(), *this, transform);
 
         view->updateAllLifecyclePhases();
-        view->paint(&imagePicture.context(), CullRect(enclosingIntRect(srcRect)));
+        view->paint(imagePicture.context(), CullRect(enclosingIntRect(srcRect)));
         ASSERT(!view->needsLayout());
     }
 
     {
         SkAutoCanvasRestore ar(canvas, false);
         if (drawNeedsLayer(paint)) {
             SkRect layerRect = dstRect;
             canvas->saveLayer(&layerRect, &paint);
         }
         RefPtr<const SkPicture> recording = imagePicture.endRecording();
@@ skipping 179 matching lines @@
 
     return m_page;
 }
 
 String SVGImage::filenameExtension() const
 {
     return "svg";
 }
 
 }