Reviewed by Jeremy Orlow.

        [Chromium] Default popup window size should not depend on zoom level
        https://bugs.webkit.org/show_bug.cgi?id=39835

        V8DOMWindow::openCallback should not set width and height of new
        window unless specified in the function's arguments.

        There is already code to reset the new window's origin coordinates,
        but the same thing should be done to its dimensions as well. Otherwise,
        a new popup with unspecified size will have its size depending on the
        parent's zoom level, which is not desirable.

        This is the same as what is done in
        bindings/js/JSDOMWindowCustom.cpp:826.

        * bindings/v8/custom/V8DOMWindowCustom.cpp:
        (WebCore::V8DOMWindow::openCallback):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@60324 268f45cc-cd09-0410-ab3c-d52691b4dbfc