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: I5ea9fd50ba6da87d5867513c81c5e3bdb0524a32 Reviewed-on: https://webrtc-review.googlesource.com/2689 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Reviewed-by: Elad Alon <eladalon@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20159}