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Disable the non-fatal logging, because fuzzing triggers tons of such
messages, which are useless and only slow down the fuzzing.

Note that some of the logging spam - mainly caused by the SYSLOG macros
- stays intact, since there's no easy way to disable those.

Bug: 811690
Change-Id: I9f93b0e2450d8ff9ec7c7a9a8c88c3c23947e7ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215827Reviewed-by: Olya Kalitova <okalitova@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772179}