- next step towards atomic identifiers; Identifier is no longer derived from UString

        * kjs/identifier.h: Remove base class and add _ustring member.
        * kjs/identifier.cpp: Add null and an == that works with const char *.
        * kjs/property_map.cpp: Get rep through _ustring.

        * kjs/function.cpp: (FunctionImp::parameterString): Call ustring().
        * kjs/function_object.cpp: (FunctionProtoFuncImp::call): Ditto.
        * kjs/nodes.cpp:
        (PropertyNode::evaluate): Ditto.
        (VarDeclNode::evaluate): Ditto.
        (ForInNode::execute): Ditto.
        * kjs/nodes2string.cpp: (SourceStream::operator<<): Add overload for Identifier.
        * kjs/reference.cpp: (Reference::getValue): Call ustring().
        * kjs/regexp_object.cpp: (RegExpObjectImp::get): Call ustring().

WebCore:

	- next step towards atomic identifiers; Identifier is no longer derived from UString

        * khtml/ecma/kjs_binding.cpp:
        (Identifier::string): Added.
        (Identifier::qstring): Added.

        * khtml/ecma/kjs_binding.h:
        * khtml/ecma/kjs_css.cpp:
        (jsNameToProp):
        (DOMCSSStyleDeclaration::tryPut):
        (DOMStyleSheet::tryPut):
        (DOMStyleSheetList::tryGet):
        (DOMMediaList::tryGet):
        (DOMCSSRuleList::tryGet):
        (DOMCSSValueList::tryGet):
        * khtml/ecma/kjs_dom.cpp:
        (DOMNodeList::hasProperty):
        (DOMNodeList::tryGet):
        (DOMNodeListFunc::DOMNodeListFunc):
        (DOMElement::tryGet):
        (DOMNamedNodeMap::hasProperty):
        (DOMNamedNodeMap::tryGet):
        (DOMNamedNodesCollection::tryGet):
        * khtml/ecma/kjs_html.cpp:
        (KJS::HTMLDocument::tryGet):
        (HTMLElementFunction::HTMLElementFunction):
        (KJS::HTMLElement::putValue):
        (KJS::HTMLCollection::hasProperty):
        (KJS::HTMLCollection::tryGet):
        (KJS::HTMLSelectCollection::tryPut):
        (OptionConstructorImp::OptionConstructorImp):
        * khtml/ecma/kjs_navigator.cpp:
        (Plugins::get):
        (MimeTypes::get):
        (Plugin::get):
        * khtml/ecma/kjs_window.cpp:
        (WindowFunc::tryCall):
        (FrameArray::get):
	Use lengthPropertyName instead of "length" for better speed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2766 268f45cc-cd09-0410-ab3c-d52691b4dbfc