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This performs a one-time re-enabling of the Messages feature if the PWA
is installed but the feature is in the disabled state.  This also
prevents showing the pairing lost notification if unpaired when
re-enabled.

Bug: 1131140
Change-Id: I1114cab793c9bad4387c6edf886bcbd735fa7ca3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432109
Commit-Queue: Jon Mann <jonmann@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811598}