Reviewed by Ada.

    Reviewed by Ada.

        Pippity-poppity popup tweaks.

        * WebCore.xcodeproj/project.pbxproj: Removed PopupMenu.cpp from project.
        * html/HTMLSelectElement.cpp:
        (WebCore::HTMLSelectElement::setSelectedIndex): Only fire onChange if
        requested and the new index is actually different than the old one.
        * platform/IntPoint.h: Added another casting operator.
        * platform/PopupMenu.cpp: Removed. The code in here, while
        platform-independent, was only useful for the NSPopUpButtonCell
        implementation of popup menus, so I've moved it to PopupMenuMac.mm.
        * platform/PopupMenu.h: Moved the definition of PopupMenu::create into
        the header since it's fairly simple. Made some more methods private now
        that we don't have subclasses and virtual methods anymore.
        (WebCore::PopupMenu::create):
        (WebCore::PopupMenu::menuList):
        (WebCore::PopupMenu::itemHeight):
        (WebCore::PopupMenu::windowRect):
        (WebCore::PopupMenu::listIndexAtPoint):
        (WebCore::PopupMenu::focusedIndex):
        (WebCore::PopupMenu::setWasClicked):
        (WebCore::PopupMenu::wasClicked):
        (WebCore::PopupMenu::setScrollOffset):
        (WebCore::PopupMenu::scrollOffset):
        (WebCore::PopupMenu::wheelDelta):
        * platform/mac/PopupMenuMac.mm: Added the code from PopupMenu.cpp.
        (WebCore::PopupMenu::populate): Call our own clear() method to clear
        the menu.
        * platform/win/IntPointWin.cpp: New casting operator.
        (WebCore::IntPoint::IntPoint):
        (WebCore::IntPoint::operator POINTS):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@17151 268f45cc-cd09-0410-ab3c-d52691b4dbfc