Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 800 matching lines @@
             keyframes[i]->setPropertyValue(id, CSSAnimatableValueFactory::create(id, *state.style()).get());
         }
     }
     return KeyframeEffectModel::create(keyframes);
 }
 
 PassRefPtr<PseudoElement> StyleResolver::createPseudoElementIfNeeded(Element& parent, PseudoId pseudoId)
 {
     RenderObject* parentRenderer = parent.renderer();
     if (!parentRenderer)
-        return 0;
+        return nullptr;
 
     if (pseudoId < FIRST_INTERNAL_PSEUDOID && !parentRenderer->style()->hasPseudoStyle(pseudoId))
-        return 0;
+        return nullptr;
 
     if (pseudoId == BACKDROP && !parent.isInTopLayer())
-        return 0;
+        return nullptr;
 
     if (!parentRenderer->canHaveGeneratedChildren())
-        return 0;
+        return nullptr;
 
     RenderStyle* parentStyle = parentRenderer->style();
     StyleResolverState state(document(), &parent, parentStyle);
     if (!pseudoStyleForElementInternal(parent, pseudoId, parentStyle, state))
-        return 0;
+        return nullptr;
     RefPtr<RenderStyle> style = state.takeStyle();
     ASSERT(style);
 
     if (!pseudoElementRendererIsNeeded(style.get()))
-        return 0;
+        return nullptr;
 
     parentStyle->addCachedPseudoStyle(style.release());
     RefPtr<PseudoElement> pseudo = PseudoElement::create(&parent, pseudoId);
 
     setAnimationUpdateIfNeeded(state, *pseudo);
     if (ActiveAnimations* activeAnimations = pseudo->activeAnimations())
         activeAnimations->cssAnimations().maybeApplyPendingUpdate(pseudo.get());
     return pseudo.release();
 }
 
@@ skipping 50 matching lines @@
     if (state.style()->hasViewportUnits())
         document().setHasViewportUnits();
 
     return true;
 }
 
 PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(Element* element, const PseudoStyleRequest& pseudoStyleRequest, RenderStyle* parentStyle)
 {
     ASSERT(parentStyle);
     if (!element)
-        return 0;
+        return nullptr;
 
     StyleResolverState state(document(), element, parentStyle);
     if (!pseudoStyleForElementInternal(*element, pseudoStyleRequest, parentStyle, state))
-        return 0;
+        return nullptr;
 
     if (PseudoElement* pseudoElement = element->pseudoElement(pseudoStyleRequest.pseudoId))
         setAnimationUpdateIfNeeded(state, *pseudoElement);
 
     // Now return the style.
     return state.takeStyle();
 }
 
 PassRefPtr<RenderStyle> StyleResolver::styleForPage(int pageIndex)
 {
@@ skipping 485 matching lines @@
 bool StyleResolver::mediaQueryAffectedByViewportChange() const
 {
     for (unsigned i = 0; i < m_viewportDependentMediaQueryResults.size(); ++i) {
         if (m_medium->eval(&m_viewportDependentMediaQueryResults[i]->m_expression) != m_viewportDependentMediaQueryResults[i]->m_result)
             return true;
     }
     return false;
 }
 
 } // namespace WebCore