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

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 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 440 matching lines @@
 
         AffineTransform transform;
 #if OS(POSIX) && !OS(MACOSX)
         transform.scale(scale);
 #endif
         transform.translate(static_cast<float>(-pageRect.x()), static_cast<float>(-pageRect.y()));
         TransformRecorder transformRecorder(context, *this, transform);
 
         ClipRecorder clipRecorder(context, *this, DisplayItem::ClipPrintedPage, LayoutRect(pageRect));
 
-        frame()->view()->paintContents(&context, GlobalPaintNormalPhase, pageRect);
+        frame()->view()->paintContents(context, GlobalPaintNormalPhase, pageRect);
 
         {
             DrawingRecorder lineBoundaryRecorder(context, *this, DisplayItem::PrintedContentDestinationLocations, pageRect);
             outputLinkedDestinations(context, pageRect);
         }
 
         return scale;
     }
 
 private:
@@ skipping 1776 matching lines @@
 }
 
 WebSandboxFlags WebLocalFrameImpl::effectiveSandboxFlags() const
 {
     if (!frame())
         return WebSandboxFlags::None;
     return static_cast<WebSandboxFlags>(frame()->loader().effectiveSandboxFlags());
 }
 
 } // namespace blink