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This CL moves the call to Init Previews into ProfileManager alongside
similar calls.

Bug: 896001
Change-Id: If1bcecd73b9b5cab9f4ec101bd1e0e09867dba28
Reviewed-on: https://chromium-review.googlesource.com/c/1308990Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604757}