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

third_party/WebKit/Source/core/page/PrintContextTest.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "core/page/PrintContext.h"
 
 #include "core/dom/Document.h"
 
 #include "core/frame/FrameView.h"
@@ skipping 82 matching lines @@
     }
 
     void printSinglePage(SkCanvas& canvas)
     {
         IntRect pageRect(0, 0, kPageWidth, kPageHeight);
         printContext().begin(pageRect.width(), pageRect.height());
         document().view()->updateAllLifecyclePhases();
         SkPictureBuilder pictureBuilder(pageRect);
         GraphicsContext& context = pictureBuilder.context();
         context.setPrinting(true);
-        document().view()->paintContents(&context, GlobalPaintPrinting, pageRect);
+        document().view()->paintContents(context, GlobalPaintPrinting, pageRect);
         {
             DrawingRecorder recorder(context, *document().layoutView(), DisplayItem::PrintedContentDestinationLocations, pageRect);
             printContext().outputLinkedDestinations(context, pageRect);
         }
         pictureBuilder.endRecording()->playback(&canvas);
         printContext().end();
     }
 
     static String absoluteBlockHtmlForLink(int x, int y, int width, int height, const char* url, const char* children = nullptr)
     {
@@ skipping 227 matching lines @@
     EXPECT_SKRECT_EQ(150, 160, 170, 180, operations[1].rect);
     EXPECT_EQ(MockCanvas::DrawRect, operations[2].type);
     EXPECT_SKRECT_EQ(250, 260, 270, 280, operations[2].rect);
 
     subframe->detach(FrameDetachType::Remove);
     static_cast<SingleChildFrameLoaderClient*>(document().frame()->client())->setChild(nullptr);
     document().frame()->host()->decrementSubframeCount();
 }
 
 } // namespace blink