Make classes and structures in core/html fast-allocated.

Source/core/html/parser/HTMLEntityParser.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 10 matching lines @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLEntityParser_h
 #define HTMLEntityParser_h
 
 #include "platform/text/SegmentedString.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class DecodedHTMLEntity {
+    STACK_ALLOCATED();
 private:
     // HTML entities contain at most four UTF-16 code units.
     static const unsigned kMaxLength = 4;
 
 public:
     DecodedHTMLEntity() : length(0) { }
 
     bool isEmpty() const { return !length; }
 
     void append(UChar c)
@@ skipping 17 matching lines @@
 };
 
 bool consumeHTMLEntity(SegmentedString&, DecodedHTMLEntity& decodedEntity, bool& notEnoughCharacters, UChar additionalAllowedCharacter = '\0');
 
 // Used by the XML parser.  Not suitable for use in HTML parsing.  Use consumeHTMLEntity instead.
 size_t decodeNamedEntityToUCharArray(const char*, UChar result[4]);
 
 }
 
 #endif