Switch to new critsect interface for DataLog.
Switch to new critsect interface for DataLog.

The introduction of the new interface broke DataLog in a release build
(with enable_data_logging=1).

TBR=henrike@webrtc.org
TEST=build Linux/Release with enable_data_logging=1

Review URL: http://webrtc-codereview.appspot.com/334001

git-svn-id: 9b397c5dfe384c04b1b200d5305b653241000171@1212 4adac7df-926f-26a2-2b94-8c16560cd09d

lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override