Reviewed by Maciej Stachowiak.
        
        In preparation for making List a simple stack-allocated Vector:

        Removed all instances of List copying and/or assignment, and made List 
        inherit from Noncopyable.
        
        Functions that used to return a List by copy now take List& out 
        parameters.
        
        Layout tests and JS tests pass.

        * kjs/list.cpp:
        (KJS::List::slice): Replaced copyTail with a more generic slice 
        alternative. (JavaScriptCore only calls slice(1), but WebCore calls 
        slice(2)).

WebCore:

        Reviewed by Maciej Stachowiak.
        
        In preparation for making List a simple stack-allocated Vector:

        Removed all instances of List copying, assignment, and/or storage.
        
        Layout tests and JS tests pass.

        * bindings/js/kjs_window.cpp:
        (KJS::WindowFunc::callAsFunction): Stores a Vector of protected 
        JSValue*'s instead of a List now. Converts to List on the fly when 
        calling the timer function. This is slightly less efficient, but the 
        common case is 0-2 arguments, so it's no biggie.

        (HTML iBench shows no regression. PLT does not use JS timers.)
        
        (KJS::ScheduledAction::execute): Uses the more efficient and non-copying
        List::slice now.
        (KJS::ScheduledAction::ScheduledAction): ditto

        * bindings/objc/WebScriptObject.mm:
        (getListFromNSArray): Takes a List out parameter now, to avoid copying.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27373 268f45cc-cd09-0410-ab3c-d52691b4dbfc