Peter Boström 225789d067 Move logging CriticalSection into implementation.
Prevents including platform headers from all files that include logging.
Also removes warn_slow_logs_delay_ which adds contention to the logging
critical section.

BUG=
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1416373004 .

Cr-Commit-Position: refs/heads/master@{#10388}
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