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Occasionally prune pending remote-bound WebRTC event logs.
This prevents them from staying on disk for longer than the
retention time, in cases where the triggers to non-proactive
pruning do not happen (Chrome is not restarted, peer connections
are not started/stopped, etc.).

Bug: 775415
Change-Id: I1a4e81495b12813776528ed678a445add1fe185f
Reviewed-on: https://chromium-review.googlesource.com/1005234Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Elad Alon <eladalon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549707}