Replaced HTMLIdentifier with an atomized string factory function

Source/core/html/parser/HTMLParserIdioms.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 #ifndef HTMLParserIdioms_h
 #define HTMLParserIdioms_h
 
 #include "core/dom/QualifiedName.h"
-#include "core/html/parser/HTMLIdentifier.h"
 #include "platform/Decimal.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 // Space characters as defined by the HTML specification.
 bool isHTMLSpace(UChar);
 bool isHTMLLineBreak(UChar);
 bool isNotHTMLSpace(UChar);
@@ skipping 51 matching lines @@
     return character <= '\r' && (character == '\n' || character == '\r');
 }
 
 template<typename CharType>
 inline bool isNotHTMLSpace(CharType character)
 {
     return !isHTMLSpace<CharType>(character);
 }
 
 bool threadSafeMatch(const QualifiedName&, const QualifiedName&);
-bool threadSafeMatch(const HTMLIdentifier&, const QualifiedName&);
-inline bool threadSafeHTMLNamesMatch(const HTMLIdentifier& tagName, const QualifiedName& qName)
+bool threadSafeMatch(const String&, const QualifiedName&);
+
+StringImpl* findStringIfStatic(const UChar* characters, unsigned length);
+
+enum CharacterWidth {
+    Likely8Bit,
+    Force8Bit,
+    Force16Bit
+};
+
+template<size_t inlineCapacity>
+static String attemptStaticStringCreation(const Vector<UChar, inlineCapacity>& vector, CharacterWidth width)
 {
-    // When the QualifiedName is known to HTMLIdentifier,
-    // all we have to do is a pointer compare.
-    ASSERT(HTMLIdentifier::isKnown(qName.localName().impl()));
-    return tagName.asStringImpl() == qName.localName().impl();
+    String string(findStringIfStatic(vector.data(), vector.size()));
+    if (string.impl())
+        return string;
+    if (width == Likely8Bit)
+        string = StringImpl::create8BitIfPossible(vector);
+    else if (width == Force8Bit)
+        string = String::make8BitFrom16BitSource(vector);
+    else
+        string = String(vector);
+
+    return string;
 }
 
 }
-
 #endif