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When the ForceEphemeralProfiles policy is enabled, Chrome tries to
clean up sensitive files when the last window in a profile is closed.
However, the Custom Dictionary.txt file is still populated, and it
can contain sensitive (e.g., a customer's name that was added to
spellcheck).

With this patch, the Custom Dictionary.txt file is properly cleared
when the last window in an ephemeral profile closes.

TESTED=Created a new profile in epehemeral mode, added some dictionary
       words, then closed it. Checked that
       Custom Dictionary.txt{,.backup} didn't contain the words. Also
       tested with Sync turned on, to make sure the words were not
       cleared from synced data.

Bug: 1132950
Change-Id: If50f0f78fc89a7bbdbc1b563856bc36288c53c5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441947Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Guillaume Jenkins <gujen@google.com>
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816673}