Update common/webrtc/webrtc-rwlock_null.patch
Update common/webrtc/webrtc-rwlock_null.patch

Move rw_lock_wrapper.h to rtc_base/synchronization/
https://webrtc-review.googlesource.com/21328

electron/libchromiumcontent,atom/libchromiumcontent,atom/libchromiumcontent,electron/libchromiumcontent