Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/rendering/RenderLayerScrollableArea.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 806 matching lines @@
 {
     RefPtr<Scrollbar>& scrollbar = orientation == HorizontalScrollbar ? m_hBar : m_vBar;
     if (!scrollbar)
         return;
 
     if (!scrollbar->isCustomScrollbar())
         willRemoveScrollbar(scrollbar.get(), orientation);
 
     scrollbar->removeFromParent();
     scrollbar->disconnectFromScrollableArea();
-    scrollbar = 0;
+    scrollbar = nullptr;
 }
 
 void RenderLayerScrollableArea::setHasHorizontalScrollbar(bool hasScrollbar)
 {
     if (hasScrollbar == hasHorizontalScrollbar())
         return;
 
     if (hasScrollbar)
         m_hBar = createScrollbar(HorizontalScrollbar);
     else
@@ skipping 92 matching lines @@
 {
     if (FrameView* frameView = m_box->view()->frameView())
         return frameView->containsScrollableArea(this);
 
     return false;
 }
 
 void RenderLayerScrollableArea::updateScrollCornerStyle()
 {
     RenderObject* actualRenderer = rendererForScrollbar(m_box);
-    RefPtr<RenderStyle> corner = m_box->hasOverflowClip() ? actualRenderer->getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), actualRenderer->style()) : PassRefPtr<RenderStyle>(0);
+    RefPtr<RenderStyle> corner = m_box->hasOverflowClip() ? actualRenderer->getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), actualRenderer->style()) : PassRefPtr<RenderStyle>(nullptr);
     if (corner) {
         if (!m_scrollCorner) {
             m_scrollCorner = RenderScrollbarPart::createAnonymous(&m_box->document());
             m_scrollCorner->setParent(m_box);
         }
         m_scrollCorner->setStyle(corner.release());
     } else if (m_scrollCorner) {
         m_scrollCorner->destroy();
         m_scrollCorner = 0;
     }
@@ skipping 244 matching lines @@
         return;
     if (m_box->canResize())
         frameView->addResizerArea(m_box);
     else
         frameView->removeResizerArea(m_box);
 }
 
 void RenderLayerScrollableArea::updateResizerStyle()
 {
     RenderObject* actualRenderer = rendererForScrollbar(m_box);
-    RefPtr<RenderStyle> resizer = m_box->hasOverflowClip() ? actualRenderer->getUncachedPseudoStyle(PseudoStyleRequest(RESIZER), actualRenderer->style()) : PassRefPtr<RenderStyle>(0);
+    RefPtr<RenderStyle> resizer = m_box->hasOverflowClip() ? actualRenderer->getUncachedPseudoStyle(PseudoStyleRequest(RESIZER), actualRenderer->style()) : PassRefPtr<RenderStyle>(nullptr);
     if (resizer) {
         if (!m_resizer) {
             m_resizer = RenderScrollbarPart::createAnonymous(&m_box->document());
             m_resizer->setParent(m_box);
         }
         m_resizer->setStyle(resizer.release());
     } else if (m_resizer) {
         m_resizer->destroy();
         m_resizer = 0;
     }
@@ skipping 284 matching lines @@
 void RenderLayerScrollableArea::setForceNeedsCompositedScrolling(ForceNeedsCompositedScrollingMode mode)
 {
     if (m_forceNeedsCompositedScrolling == mode)
         return;
 
     m_forceNeedsCompositedScrolling = mode;
     layer()->didUpdateNeedsCompositedScrolling();
 }
 
 } // Namespace WebCore