Fix status bubble positioning on non-tiled window managers.
Fix status bubble positioning on non-tiled window managers.

gtk_window_get_position includes the window decoration, so it was the wrong
function to use.
Also, switch to using the requisition rather than getting the top-level size,
as that is what we use elsewhere.

Review URL: http://codereview.chromium.org/21515

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@10040 0039d316-1c4b-4281-b951-d872f2087c98

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