Use the right TextRun length when checking for surrogate pairs

third_party/WebKit/Source/core/layout/svg/SVGTextMetricsBuilder.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 22 matching lines @@
 #include "wtf/Vector.h"
 
 namespace blink {
 
 namespace {
 
 inline bool characterStartsSurrogatePair(const TextRun& run, unsigned index)
 {
     if (!U16_IS_LEAD(run[index]))
         return false;
-    if (index + 1 >= static_cast<unsigned>(run.charactersLength()))
+    if (index + 1 >= static_cast<unsigned>(run.length()))
         return false;
     return U16_IS_TRAIL(run[index + 1]);
 }
 
 class SVGTextMetricsCalculator {
 public:
     SVGTextMetricsCalculator(LineLayoutSVGInlineText);
     ~SVGTextMetricsCalculator();
 
     bool advancePosition();
@@ skipping 297 matching lines @@
 {
     walkTree(textRoot, &text);
 }
 
 void SVGTextMetricsBuilder::buildMetricsAndLayoutAttributes(LayoutSVGText& textRoot, SVGCharacterDataMap& allCharactersMap)
 {
     walkTree(textRoot, nullptr, &allCharactersMap);
 }
 
 } // namespace blink