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

third_party/WebKit/Source/web/InspectorOverlay.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 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
@@ skipping 101 matching lines @@
 
     void paintPageOverlay(const PageOverlay&, GraphicsContext& graphicsContext, const WebSize& webViewSize) const override
     {
         if (m_overlay->isEmpty())
             return;
 
         // Skip cache because the following paint may conflict with the view's real painting.
         DisplayItemCacheSkipper cacheSkipper(graphicsContext);
         FrameView* view = m_overlay->overlayMainFrame()->view();
         ASSERT(!view->needsLayout());
-        view->paint(&graphicsContext, CullRect(IntRect(0, 0, view->width(), view->height())));
+        view->paint(graphicsContext, CullRect(IntRect(0, 0, view->width(), view->height())));
     }
 
 private:
     RawPtrWillBeMember<InspectorOverlay> m_overlay;
 };
 
 
 class InspectorOverlay::InspectorOverlayChromeClient final : public EmptyChromeClient {
 public:
     static PassOwnPtrWillBeRawPtr<InspectorOverlayChromeClient> create(ChromeClient& client, InspectorOverlay& overlay)
@@ skipping 612 matching lines @@
 
 void InspectorOverlay::initializeLayoutEditorIfNeeded(Node* node)
 {
     if (m_inspectMode != InspectorDOMAgent::ShowLayoutEditor || !node || !node->isElementNode() || !node->ownerDocument()->isActive())
         return;
     m_layoutEditor = LayoutEditor::create(toElement(node), m_cssAgent, m_domAgent, &overlayMainFrame()->script());
     toChromeClientImpl(m_webViewImpl->page()->chromeClient()).setCursorOverridden(true);
 }
 
 } // namespace blink