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

Source/core/dom/custom/CustomElementDescriptorHash.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR 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 CustomElementDescriptorHash_h
 #define CustomElementDescriptorHash_h
 
 #include "core/dom/custom/CustomElementDescriptor.h"
+#include "wtf/Allocator.h"
 #include "wtf/HashFunctions.h"
 #include "wtf/HashTraits.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
 struct CustomElementDescriptorHash {
+    STATIC_ONLY(CustomElementDescriptorHash);
     static unsigned hash(const CustomElementDescriptor& descriptor)
     {
         return WTF::pairIntHash(AtomicStringHash::hash(descriptor.type()), WTF::pairIntHash(AtomicStringHash::hash(descriptor.namespaceURI()), AtomicStringHash::hash(descriptor.localName())));
     }
 
     static bool equal(const CustomElementDescriptor& a, const CustomElementDescriptor& b)
     {
         return a == b;
     }
 
     static const bool safeToCompareToEmptyOrDeleted = true;
 };
 
 } // namespace blink
 
 namespace WTF {
 
 template<>
 struct HashTraits<blink::CustomElementDescriptor> : SimpleClassHashTraits<blink::CustomElementDescriptor> {
+    STATIC_ONLY(HashTraits);
     static const bool emptyValueIsZero = HashTraits<AtomicString>::emptyValueIsZero;
 };
 
 } // namespace WTF
 
 #endif // CustomElementDescriptorHash