Reviewed by Hyatt.

        Test for <rdar://problem/4697438> REGRESSION: select menu lists match the wrong css rule on www.chainreaction.com

        * fast/forms/select-size-expected.checksum: Added.
        * fast/forms/select-size-expected.png: Added.
        * fast/forms/select-size-expected.txt: Added.
        * fast/forms/select-size.html: Added.

WebCore:

        Reviewed by Hyatt.

        Fix for: <rdar://problem/4697438> REGRESSION: select menu lists match the wrong css rule on www.chainreaction.com

        Update the size attribute value for select elements to match the numeric value.  This is a special case since this
        attribute is used to determine which control to use.  We want to make sure that the size attribute is valid when we match
        CSS rules.

        Test: fast/forms/select-size.html

        * html/HTMLSelectElement.cpp: (WebCore::HTMLSelectElement::parseMappedAttribute): If the attribute string value is not the
          same as its integer value, then update the attribute value to match the integer.
        * dom/Attribute.h: Made setValue and setPrefix public.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@18996 268f45cc-cd09-0410-ab3c-d52691b4dbfc