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When a profile is loaded for the first time, if the policy
controlling remote-bound WebRTC event logs is disabled, clear
any pending logs from previous times the profile was loaded, when
the policy might have been enabled.

Bug: 775415
Change-Id: If20928ba660f0be5a73c52a11ae521c5246c174a
Reviewed-on: https://chromium-review.googlesource.com/1162322
Commit-Queue: Elad Alon <eladalon@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582869}