Use StringView for equalIgnoringCase.

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 421 matching lines @@
 inline bool operator!=(const String& a, const String& b) { return !equal(a.impl(), b.impl()); }
 inline bool operator!=(const String& a, const LChar* b) { return !equal(a.impl(), b); }
 inline bool operator!=(const String& a, const char* b) { return !equal(a.impl(), reinterpret_cast<const LChar*>(b)); }
 inline bool operator!=(const LChar* a, const String& b) { return !equal(a, b.impl()); }
 inline bool operator!=(const char* a, const String& b) { return !equal(reinterpret_cast<const LChar*>(a), b.impl()); }
 template<size_t inlineCapacity>
 inline bool operator!=(const Vector<char, inlineCapacity>& a, const String& b) { return !(a == b); }
 template<size_t inlineCapacity>
 inline bool operator!=(const String& a, const Vector<char, inlineCapacity>& b) { return b != a; }
 
-inline bool equalIgnoringCase(const String& a, const String& b) { return equalIgnoringCase(a.impl(), b.impl()); }
-inline bool equalIgnoringCase(const String& a, const LChar* b) { return equalIgnoringCase(a.impl(), b); }
-inline bool equalIgnoringCase(const String& a, const char* b) { return equalIgnoringCase(a.impl(), reinterpret_cast<const LChar*>(b)); }
-inline bool equalIgnoringCase(const LChar* a, const String& b) { return equalIgnoringCase(a, b.impl()); }
-inline bool equalIgnoringCase(const char* a, const String& b) { return equalIgnoringCase(reinterpret_cast<const LChar*>(a), b.impl()); }
-
 inline bool equalPossiblyIgnoringCase(const String& a, const String& b, bool ignoreCase)
 {
     return ignoreCase ? equalIgnoringCase(a, b) : (a == b);
 }
 
 inline bool equalIgnoringNullity(const String& a, const String& b) { return equalIgnoringNullity(a.impl(), b.impl()); }
 
 template<size_t inlineCapacity>
 inline bool equalIgnoringNullity(const Vector<UChar, inlineCapacity>& a, const String& b) { return equalIgnoringNullity(a, b.impl()); }
 
@@ skipping 158 matching lines @@
 using WTF::CString;
 using WTF::KeepTrailingZeros;
 using WTF::StrictUTF8Conversion;
 using WTF::StrictUTF8ConversionReplacingUnpairedSurrogatesWithFFFD;
 using WTF::String;
 using WTF::emptyString;
 using WTF::emptyString16Bit;
 using WTF::append;
 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