The unified Log() interface replaces the many old LogX() functions. This helps hide dependencies between the modules which log different events. TBR=stefan@webrtc.org Bug: webrtc:8111 Change-Id: I36c8b6c4cf03d738c9033af2e98db6dc200eede9 Reviewed-on: https://webrtc-review.googlesource.com/6940 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Elad Alon <eladalon@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20170}