Always re-layout the app menu to get sync system state.
Always re-layout the app menu to get sync system state.

BUG=25103
TEST=Start chrome, verify app menu says 'Synchronize my bookmarks...'.
Click it, and set up sync. Reopen app menu, and it should say 'Bookmarks synced...'

Review URL: http://codereview.chromium.org/274078

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@29339 0039d316-1c4b-4281-b951-d872f2087c98

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