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If EncryptEverythingAllowed() was false, then PeopleHandler already
skipped the call to EnableEncryptEverything(), but it did still call
SetEncryptionPassphrase(). That could get users into a weird state
where Sync stopped working.
This CL fixes the issue by also skipping the SetEncryptionPassphrase()
call in case EncryptEverythingAllowed() is false.

Bug: 924847
Change-Id: I3b606e3ea9d0a8f86b865b41eda233dd472cc1eb
Reviewed-on: https://chromium-review.googlesource.com/c/1439299Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627004}