Reviewed by John Sullivan.

    Reviewed by John Sullivan.

        <rdar://problem/4671069> REGRESSION: Popup buttons in web pages aren't exposed as AXPopupButtons

        Accessorized RenderMenuList objects.

        * bridge/mac/WebCoreAXObject.mm:
        (-[WebCoreAXObject mouseButtonListener]):
        Trivial formatting.

        (-[WebCoreAXObject actionElement]):
        Return the HTMLSelectElement.

        (-[WebCoreAXObject firstChild]):
        (-[WebCoreAXObject lastChild]):
        (-[WebCoreAXObject previousSibling]):
        (-[WebCoreAXObject nextSibling]):
        (-[WebCoreAXObject parentObject]):
        (-[WebCoreAXObject parentObjectUnignored]):
        (-[WebCoreAXObject isAttachment]):
        (-[WebCoreAXObject attachmentView]):
        Trivial formatting.

        (-[WebCoreAXObject role]):
        Return NSAccessibilityPopUpButtonRole.

        (-[WebCoreAXObject subrole]):
        Trivial formatting.

        (-[WebCoreAXObject roleDescription]):
        Return NSAccessibilityPopUpButtonRole.

        (-[WebCoreAXObject textUnderElement]):
        Trivial formatting.

        (-[WebCoreAXObject value]):
        Return the RenderMenuList::text().

        (-[WebCoreAXObject position]):
         Trivial formatting.

        (-[WebCoreAXObject accessibilityIsIgnored]):
        - Ignore popup menu items because AppKit does.
        - Remove redundant check for buttonTag (earlier isControl() check suffices).

        (-[WebCoreAXObject accessibilityAttributeNames]):
        (-[WebCoreAXObject accessibilityActionNames]):
        (-[WebCoreAXObject accessibilityAttributeValue:]):
        Trivial formatting.

        (-[WebCoreAXObject doAXTextMarkerRangeForUnorderedTextMarkers:]):
        Removed old debugging code that is no longer needed.
        Trivial formatting.

        (-[WebCoreAXObject doAXSentenceTextMarkerRangeForTextMarker:]):
        (-[WebCoreAXObject doAXParagraphTextMarkerRangeForTextMarker:]):
        (-[WebCoreAXObject removeAXObjectID]):
        Trivial formatting.

        * html/HTMLSelectElement.cpp:
        (WebCore::HTMLSelectElement::accessKeyAction):
        Call click() instead of focus().

        * rendering/RenderMenuList.cpp:
        (WebCore::RenderMenuList::text):
        Added for easy access to popup's current text.

        * rendering/RenderMenuList.h:
        (WebCore::RenderMenuList::isMenuList):
        * rendering/RenderObject.h:
        (WebCore::RenderObject::isMenuList):
        Added so popups can be identified.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15930 268f45cc-cd09-0410-ab3c-d52691b4dbfc