GTK: Fix startup UMR.
GTK: Fix startup UMR.

The bookmark bar calls IsFullScreen() during startup, which queries state_.

I checked to see if relying on a dummy value would get us into trouble with some crazy corner case where we are in the wrong floating state---it doesn't appear to.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/328014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@29963 0039d316-1c4b-4281-b951-d872f2087c98

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