Use StringView for String::reverseFind.

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 171 matching lines @@
     size_t find(const StringView& value, unsigned start = 0, TextCaseSensitivity caseSensitivity = TextCaseSensitive) const
         { return m_impl ? DISPATCH_CASE_OP(caseSensitivity, m_impl->find, (value, start)) : kNotFound; }
 
     bool contains(char c) const { return find(c) != kNotFound; }
     bool contains(const StringView& value, TextCaseSensitivity caseSensitivity = TextCaseSensitive) const
         { return find(value, 0, caseSensitivity) != 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; }
+    size_t reverseFind(const StringView& value, unsigned start = UINT_MAX) const
+        { return m_impl ? m_impl->reverseFind(value, 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
         { return m_impl ? m_impl->findIgnoringCase(str.impl(), start) : kNotFound; }
 
     // ASCII case insensitive string matching.
     size_t findIgnoringASCIICase(const String& str, unsigned start = 0) const
         { return m_impl ? m_impl->findIgnoringASCIICase(str.impl(), start) : kNotFound; }
@@ skipping 392 matching lines @@
 using WTF::StrictUTF8ConversionReplacingUnpairedSurrogatesWithFFFD;
 using WTF::String;
 using WTF::emptyString;
 using WTF::emptyString16Bit;
 using WTF::append;
 using WTF::charactersAreAllASCII;
 using WTF::equal;
 using WTF::find;
 using WTF::isAllSpecialCharacters;
 using WTF::isSpaceOrNewline;
-using WTF::reverseFind;
 
 #include "wtf/text/AtomicString.h"
 #endif // WTFString_h