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Avoid conflicts with LOG_FOO in sys/syslog.h on Linux.

Convert LOG_FOO to LOGGING_FOO in base/, but leave the rest of the code
base untouched. Keep LOG_FOO defined for now to make it possible to
convert the rest of the code base in smaller increments.

BUG=849450

Change-Id: Icce5121f7cd036e9e9eddd7de68f57474f4ab73c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1086147Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820349}