Move String::truncate to StringImpl.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google 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.
  *
@@ skipping 320 matching lines @@
     PassRefPtr<StringImpl> lower();
     PassRefPtr<StringImpl> lowerASCII();
     PassRefPtr<StringImpl> upper();
     PassRefPtr<StringImpl> lower(const AtomicString& localeIdentifier);
     PassRefPtr<StringImpl> upper(const AtomicString& localeIdentifier);
 
     PassRefPtr<StringImpl> fill(UChar);
     // FIXME: Do we need fill(char) or can we just do the right thing if UChar is ASCII?
     PassRefPtr<StringImpl> foldCase();
 
+    PassRefPtr<StringImpl> truncate(unsigned length);
+
     PassRefPtr<StringImpl> stripWhiteSpace();
     PassRefPtr<StringImpl> stripWhiteSpace(IsWhiteSpaceFunctionPtr);
     PassRefPtr<StringImpl> simplifyWhiteSpace(StripBehavior = StripExtraWhiteSpace);
     PassRefPtr<StringImpl> simplifyWhiteSpace(IsWhiteSpaceFunctionPtr, StripBehavior = StripExtraWhiteSpace);
 
     PassRefPtr<StringImpl> removeCharacters(CharacterMatchFunctionPtr);
     template <typename CharType>
     ALWAYS_INLINE PassRefPtr<StringImpl> removeCharacters(const CharType* characters, CharacterMatchFunctionPtr);
 
     // Remove characters between [start, start+lengthToRemove). The range is
@@ skipping 395 matching lines @@
 using WTF::TextCaseASCIIInsensitive;
 using WTF::TextCaseInsensitive;
 using WTF::TextCaseSensitive;
 using WTF::TextCaseSensitivity;
 using WTF::equal;
 using WTF::equalNonNull;
 using WTF::lengthOfNullTerminatedString;
 using WTF::reverseFind;
 
 #endif