Reviewed by Eric Seidel.

        Bug 26993 : Geolocation::requestPermission()
        https://bugs.webkit.org/show_bug.cgi?id=26993

        Second patch to allow the Geolocation permission request to chrome to be asynchronous
        or synchronous. Fixes a bug where callbacks were called twice when permissions
        are granted synchronously.

        No new tests required.

        * page/Geolocation.cpp:
        (WebCore::Geolocation::setIsAllowed): Modified. Calls makeSuccessCallbacks() rather than geolocationServicePositionChanged().
        (WebCore::Geolocation::geolocationServicePositionChanged): Modified. Updated logic to avoid repeated callbacks when permissions are granted synchronously.
        (WebCore::Geolocation::makeSuccessCallbacks): Added. Calls success callbacks.
        * page/Geolocation.h: Modified. Adds makeSuccessCallbacks().

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@47152 268f45cc-cd09-0410-ab3c-d52691b4dbfc