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

third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights
  * reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 462 matching lines @@
 }
 
 void HTMLTextAreaElement::setDefaultValue(const String& defaultValue) {
   // To preserve comments, remove only the text nodes, then add a single text
   // node.
   HeapVector<Member<Node>> textNodes;
   for (Node* n = firstChild(); n; n = n->nextSibling()) {
     if (n->isTextNode())
       textNodes.append(n);
   }
-  size_t size = textNodes.size();
-  for (size_t i = 0; i < size; ++i)
-    removeChild(textNodes[i].get(), IGNORE_EXCEPTION);
+  for (const auto& text : textNodes)
+    removeChild(text.get(), IGNORE_EXCEPTION);
 
   // Normalize line endings.
   String value = defaultValue;
   value.replace("\r\n", "\n");
   value.replace('\r', '\n');
 
   insertBefore(document().createTextNode(value), firstChild(),
                IGNORE_EXCEPTION);
 
   if (!m_isDirty)
@@ skipping 153 matching lines @@
 void HTMLTextAreaElement::copyNonAttributePropertiesFromElement(
     const Element& source) {
   const HTMLTextAreaElement& sourceElement =
       static_cast<const HTMLTextAreaElement&>(source);
   setValueCommon(sourceElement.value(), DispatchNoEvent, SetSeletion);
   m_isDirty = sourceElement.m_isDirty;
   TextControlElement::copyNonAttributePropertiesFromElement(source);
 }
 
 }  // namespace blink