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In case of test failure, Sync's FakeServer outputs a log of all
requests, which can be helpful in debugging. However in other cases,
the output can be annoying - lots of text to scroll over to get to the
actual failed expectation message.
So this CL adds a commandline switch
--disable-fake-server-failure-output to disable the verbose output, for
use in local testing/debugging.

Bug: none
Change-Id: Iaf07e79681eac1e961f0a530b6cac45548cf8742
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2104051
Auto-Submit: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750901}