This CL clean up patch in SVGElements.

Source/core/svg/SVGElementRareData.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/svg/SVGElementRareData.h"
 
 #include "core/css/CSSCursorImageValue.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/svg/SVGCursorElement.h"
 #include "platform/transforms/AffineTransform.h"
 
 namespace blink {
 
 MutableStylePropertySet* SVGElementRareData::ensureAnimatedSMILStyleProperties()
 {
     if (!m_animatedSMILStyleProperties)
         m_animatedSMILStyleProperties = MutableStylePropertySet::create(SVGAttributeMode);
     return m_animatedSMILStyleProperties.get();
 }
 
 ComputedStyle* SVGElementRareData::overrideComputedStyle(Element* element, const ComputedStyle* parentStyle)
 {
     ASSERT(element);
     if (!m_useOverrideComputedStyle)
-        return 0;
+        return nullptr;
     if (!m_overrideComputedStyle || m_needsOverrideComputedStyleUpdate) {
         // The style computed here contains no CSS Animations/Transitions or SMIL induced rules - this is needed to compute the "base value" for the SMIL animation sandwhich model.
         m_overrideComputedStyle = element->document().ensureStyleResolver().styleForElement(element, parentStyle, DisallowStyleSharing, MatchAllRulesExcludingSMIL);
         m_needsOverrideComputedStyleUpdate = false;
     }
     ASSERT(m_overrideComputedStyle);
     return m_overrideComputedStyle.get();
 }
 
 DEFINE_TRACE(SVGElementRareData)
@@ skipping 31 matching lines @@
 }
 
 AffineTransform* SVGElementRareData::animateMotionTransform()
 {
     if (!m_animateMotionTransform)
         m_animateMotionTransform = adoptPtr(new AffineTransform);
     return m_animateMotionTransform.get();
 }
 
 }