Move String::remove to StringImpl.

third_party/WebKit/Source/wtf/text/StringImpl.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) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * 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
@@ skipping 955 matching lines @@
     return data.release();
 }
 
 PassRefPtr<StringImpl> StringImpl::removeCharacters(CharacterMatchFunctionPtr findMatch)
 {
     if (is8Bit())
         return removeCharacters(characters8(), findMatch);
     return removeCharacters(characters16(), findMatch);
 }
 
+PassRefPtr<StringImpl> StringImpl::remove(unsigned start, unsigned lengthToRemove)
+{
+    if (lengthToRemove <= 0)
+        return this;
+    if (start >= m_length)
+        return this;
+
+    lengthToRemove = std::min(m_length - start, lengthToRemove);
+    unsigned removedEnd = start + lengthToRemove;
+
+    if (is8Bit()) {
+        StringBuffer<LChar> buffer(m_length - lengthToRemove);
+        copyChars(buffer.characters(), characters8(), start);
+        copyChars(buffer.characters() + start, characters8() + removedEnd, m_length - removedEnd);
+        return buffer.release();
+    }
+    StringBuffer<UChar> buffer(m_length - lengthToRemove);
+    copyChars(buffer.characters(), characters16(), start);
+    copyChars(buffer.characters() + start, characters16() + removedEnd, m_length - removedEnd);
+    return buffer.release();
+}
+
 template <typename CharType, class UCharPredicate>
 inline PassRefPtr<StringImpl> StringImpl::simplifyMatchedCharactersToSpace(UCharPredicate predicate, StripBehavior stripBehavior)
 {
     StringBuffer<CharType> data(m_length);
 
     const CharType* from = getCharacters<CharType>();
     const CharType* fromend = from + m_length;
     int outc = 0;
     bool changedToSpace = false;
 
@@ skipping 1018 matching lines @@
         } else if (localeIdMatchesLang(localeIdentifier, "lt")) {
             // TODO(rob.buis) implement upper-casing rules for lt
             // like in StringImpl::upper(locale).
         }
     }
 
     return toUpper(c);
 }
 
 } // namespace WTF