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

Source/core/layout/svg/line/SVGInlineTextBox.cpp

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
@@ skipping 157 matching lines @@
 }
 
 TextRun SVGInlineTextBox::constructTextRun(const ComputedStyle& style, const SVGTextFragment& fragment) const
 {
     LayoutText* text = &layoutObject();
 
     // FIXME(crbug.com/264211): This should not be necessary but can occur if we
     //                          layout during layout. Remove this when 264211 is fixed.
     RELEASE_ASSERT(!text->needsLayout());
 
-    TextRun run(static_cast<const LChar*>(0) // characters, will be set below if non-zero.
+    TextRun run(static_cast<const LChar*>(nullptr) // characters, will be set below if non-zero.
         , 0 // length, will be set below if non-zero.
         , 0 // xPos, only relevant with allowTabs=true
         , 0 // padding, only relevant for justified text, not relevant for SVG
         , TextRun::AllowTrailingExpansion
         , direction()
         , dirOverride() || style.rtlOrdering() == VisualOrder /* directionalOverride */);
 
     if (fragment.length) {
         if (text->is8Bit())
             run.setText(text->characters8() + fragment.characterOffset, fragment.length);
@@ skipping 80 matching lines @@
                 layoutObject().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
                 if (!result.addNodeToListBasedTestResult(layoutObject().node(), locationInContainer, rect))
                     return true;
             }
         }
     }
     return false;
 }
 
 } // namespace blink