Avoid WTF::Vector::at() and operator[] in core/xml.

third_party/WebKit/Source/core/xml/XPathParser.cpp

 /*
  * Copyright 2005 Maksim Orlovich <maksim@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 67 matching lines @@
       {"child", Step::ChildAxis},
       {"descendant", Step::DescendantAxis},
       {"descendant-or-self", Step::DescendantOrSelfAxis},
       {"following", Step::FollowingAxis},
       {"following-sibling", Step::FollowingSiblingAxis},
       {"namespace", Step::NamespaceAxis},
       {"parent", Step::ParentAxis},
       {"preceding", Step::PrecedingAxis},
       {"preceding-sibling", Step::PrecedingSiblingAxis},
       {"self", Step::SelfAxis}};
-  for (unsigned i = 0; i < sizeof(axisNameList) / sizeof(axisNameList[0]); ++i)
-    axisNames.set(axisNameList[i].name, axisNameList[i].axis);
+  for (const auto& axisName : axisNameList)
+    axisNames.set(axisName.name, axisName.axis);
 }
 
 static bool isAxisName(const String& name, Step::Axis& type) {
   DEFINE_STATIC_LOCAL(AxisNamesMap, axisNames, ());
 
   if (axisNames.isEmpty())
     setUpAxisNamesMap(axisNames);
 
   AxisNamesMap::iterator it = axisNames.find(name);
   if (it == axisNames.end())
@@ skipping 410 matching lines @@
   m_strings.add(wrapUnique(s));
 }
 
 void Parser::deleteString(String* s) {
   if (!s)
     return;
 
   DCHECK(m_strings.contains(s));
   m_strings.remove(s);
 }