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SharingService has dependency on ProfileSyncService. Make
SharingMessageBridge a separate service with its own factory to prevent
cyclic dependency.

This change does not wire the bridge to any existing service but provides
the interface for creating and using it.

Bug: 1034930
Change-Id: I9907eb2687e48c65b7203d1b10e6ad34ed981010
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007269
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Alex Chau <alexchau@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734415}