Remove unused StringImpl::findNextLineStart, StringImpl::count and reverseFindLineTerminator.

third_party/WebKit/Source/wtf/text/WTFString.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. 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,
@@ skipping 174 matching lines @@
     size_t find(const String& str) const
         { return m_impl ? m_impl->find(str.impl()) : kNotFound; }
     size_t find(const String& str, unsigned start) const
         { return m_impl ? m_impl->find(str.impl(), start) : kNotFound; }
 
     size_t find(CharacterMatchFunctionPtr matchFunction, unsigned start = 0) const
         { return m_impl ? m_impl->find(matchFunction, start) : kNotFound; }
     size_t find(const LChar* str, unsigned start = 0) const
         { return m_impl ? m_impl->find(str, start) : kNotFound; }
 
-    size_t findNextLineStart(unsigned start = 0) const
-        { return m_impl ? m_impl->findNextLineStart(start) : kNotFound; }
-
     // Find the last instance of a single character or string.
     size_t reverseFind(UChar c, unsigned start = UINT_MAX) const
         { return m_impl ? m_impl->reverseFind(c, start) : kNotFound; }
     size_t reverseFind(const String& str, unsigned start = UINT_MAX) const
         { return m_impl ? m_impl->reverseFind(str.impl(), start) : kNotFound; }
 
     // Case insensitive string matching.
     size_t findIgnoringCase(const LChar* str, unsigned start = 0) const
         { return m_impl ? m_impl->findIgnoringCase(str, start) : kNotFound; }
     size_t findIgnoringCase(const String& str, unsigned start = 0) const
@@ skipping 454 matching lines @@
 using WTF::charactersAreAllASCII;
 using WTF::equal;
 using WTF::equalIgnoringCase;
 using WTF::find;
 using WTF::isAllSpecialCharacters;
 using WTF::isSpaceOrNewline;
 using WTF::reverseFind;
 
 #include "wtf/text/AtomicString.h"
 #endif // WTFString_h