Use StringView for String and AtomicString operator==.

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.
  *
@@ skipping 424 matching lines @@
 
   template <typename CharacterType>
   void appendInternal(CharacterType);
 
   RefPtr<StringImpl> m_impl;
 };
 
 #undef DISPATCH_CASE_OP
 
 inline bool operator==(const String& a, const String& b) {
+  // We don't use equalStringView here since we want the isAtomic() fast path
+  // inside WTF::equal.
   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());
+  return equalStringView(a, b);
 }
 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 equal(b.impl(), a.data(), a.size());
-}
-template <size_t inlineCapacity>
-inline bool operator==(const String& a, const Vector<char, inlineCapacity>& b) {
   return b == a;
 }
 
 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);
+  return !(a == 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());
+  return !(a == b);
 }
 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 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());
 }
@@ skipping 121 matching lines @@
 using WTF::String;
 using WTF::emptyString;
 using WTF::emptyString16Bit;
 using WTF::charactersAreAllASCII;
 using WTF::equal;
 using WTF::find;
 using WTF::isSpaceOrNewline;
 
 #include "wtf/text/AtomicString.h"
 #endif  // WTFString_h