Make CriticalSectionWrapper non-virtual.
There's no need for this class to have a vtable since there exists only a single implementation (per platform).  It's also not good for performance.

BUG=
R=pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1601743004 .

Cr-Original-Commit-Position: refs/heads/master@{#11306}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ee5a309f12e4a3f96b8924d45e65ae01ef18d079
13 files changed