Use the convenience function gdk_screen_get_window_stack to enumerate top-level gdk windows instead of querying Xlib directly, which doesn't work across many window managers.

BUG=none
TEST=Exhaustive tab dragging in multiple window managers (Compiz, Metacity, KWM).
Review URL: http://codereview.chromium.org/119345

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18098 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed