[Extensions Toolbar] Ensure popup is closed at shutdown
Since the popup close process is asynchronous, it's possible that the popup doesn't close by the time the platform delegate is deleted. If that's the case, we need to be sure to close it, so that we do our cleanup (like removing ourselves as an observer). BUG=454361 Review URL: https://codereview.chromium.org/878813003 Cr-Commit-Position: refs/heads/master@{#314352}
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