This filters out all of the non-toplevel windows from the browser list so that they don't produce snapshots for overview mode.
This filters out all of the non-toplevel windows from the browser list
so that they don't produce snapshots for overview mode.

This also fixes the bug below.

BUG=http://code.google.com/p/chromium-os/issues/detail?id=3064
TEST=ran chrome with window manager
Review URL: http://codereview.chromium.org/1907001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@46506 0039d316-1c4b-4281-b951-d872f2087c98

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