tommi 5447934728 Remove implementation of CriticalSectionWrapper and use rtc::CriticalSection
While transitioning over to rtc::CriticalSection completely, this gives perf benefits that rtc::CriticalSection has on Mac to current users of CriticalSectionWrapper.

BUG=

Review URL: https://codereview.webrtc.org/1614373002

Cr-Commit-Position: refs/heads/master@{#11356}
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