[oilpan] Make the oilpan branch build on Mac.

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
  * modify it under the terms of the GNU Library General Public
@@ skipping 74 matching lines @@
 static inline unsigned upperBoundForLengthForSubmission(const String& text, unsigned numberOfLineBreaks)
 {
     return text.length() + numberOfLineBreaks;
 }
 
 HTMLTextAreaElement::HTMLTextAreaElement(const QualifiedName& tagName, const Handle<Document>& document, const Handle<HTMLFormElement>& form)
     : HTMLTextFormControlElement(tagName, document, form)
     , m_rows(defaultRows)
     , m_cols(defaultCols)
     , m_wrap(SoftWrap)
-    , m_placeholder(0)
     , m_isDirty(false)
     , m_wasModifiedByUser(false)
 {
     ASSERT(hasTagName(textareaTag));
     setFormControlValueMatchesRenderer(true);
     ScriptWrappable::init(this);
 }
 
 Result<HTMLTextAreaElement> HTMLTextAreaElement::create(const QualifiedName& tagName, const Handle<Document>& document, const Handle<HTMLFormElement>& form)
 {
@@ skipping 458 matching lines @@
     fixPlaceholderRenderer(m_placeholder, innerTextElement());
 }
 
 void HTMLTextAreaElement::accept(Visitor* visitor) const
 {
     visitor->visit(m_placeholder);
     HTMLTextFormControlElement::accept(visitor);
 }
 
 }