C++11: Replace 0 with nullptr where applicable in layout code.

Source/core/layout/svg/SVGTextLayoutEngine.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 27 matching lines @@
     , m_layoutAttributesPosition(0)
     , m_logicalCharacterOffset(0)
     , m_logicalMetricsListOffset(0)
     , m_x(0)
     , m_y(0)
     , m_dx(0)
     , m_dy(0)
     , m_isVerticalText(false)
     , m_inPathLayout(false)
     , m_textLengthSpacingInEffect(false)
-    , m_textPathCalculator(0)
+    , m_textPathCalculator(nullptr)
     , m_textPathLength(0)
     , m_textPathCurrentOffset(0)
     , m_textPathSpacing(0)
     , m_textPathScaling(1)
 {
     ASSERT(!m_layoutAttributes.isEmpty());
 }
 
 void SVGTextLayoutEngine::updateCharacterPositionIfNeeded(float& x, float& y)
 {
@@ skipping 294 matching lines @@
 
     // Main layout algorithm.
     const unsigned boxEndOffset = textBox->start() + textBox->len();
     while (!m_visualMetricsIterator.isAtEnd() && m_visualMetricsIterator.characterOffset() < boxEndOffset) {
         const SVGTextMetrics& visualMetrics = m_visualMetricsIterator.metrics();
         if (visualMetrics.isEmpty()) {
             m_visualMetricsIterator.next();
             continue;
         }
 
-        SVGTextLayoutAttributes* logicalAttributes = 0;
+        SVGTextLayoutAttributes* logicalAttributes = nullptr;
         if (!currentLogicalCharacterAttributes(logicalAttributes))
             break;
 
         ASSERT(logicalAttributes);
         SVGTextMetrics logicalMetrics(SVGTextMetrics::SkippedSpaceMetrics);
         if (!currentLogicalCharacterMetrics(logicalAttributes, logicalMetrics))
             break;
 
         SVGCharacterDataMap& characterDataMap = logicalAttributes->characterDataMap();
         SVGCharacterData data;
@@ skipping 158 matching lines @@
     }
 
     if (!didStartTextFragment)
         return;
 
     // Close last open fragment, if needed.
     recordTextFragment(textBox);
 }
 
 }