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MessageReceiver is responsbile for receiving serialized proto messages,
deserializing the messages, and notifying clients of the updated
messages.

Bug: 1106937
Test: unit_tests
Change-Id: I6d1c75d3f63c27213e3b85b561f6e0c3b4e47161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419757
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809168}