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This changes the ownership of SmsProvider from BrowserMainLoop to
SmsFetcher. This infrastructure change that will help with
implementation of the autofill version of sms receiver.

Bug: 1026373
Change-Id: I0f50f90a3d4b7a72443b0a6639d7d12d25ffaeb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1960068Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724063}