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We removed SDP logging earlier because it was bloating bot logs, but
nowadays logs only get printed for failing tests, and SDP information
is very useful to debug for instance webrtc:4570.

BUG=webrtc:4570,484826,479093

Review URL: https://codereview.chromium.org/1124323005

Cr-Commit-Position: refs/heads/master@{#330722}