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LoopbackServer doesn't need to deal with strings in its API, since it
deals with protos. It can be trivially refactored without behavioral
changes (relevant for local sync, i.e. enterprise).

This allows various simplifications in FakeServer.

Bug: None
Change-Id: Iffebffae9af844d27df53fe46a6b5f61c4016ce7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883516
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710066}