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* When Chrome's cache is cleared, remove pending WebRTC event logs
  as well.
* Logs which are currently being written to are not cleared; this
  is by design.
* Logs which are currently being uploaded are also not cleared.
  It is debatable whether they should be. Erring on the side of
  caution is probably more user-friendly here; a TODO is left for
  a later CL to clear those logs as well.

Bug: 775415
Change-Id: Icf13c363ff7d04e082ed0ccf52e000b5bdbf75a4
Reviewed-on: https://chromium-review.googlesource.com/966562
Commit-Queue: Elad Alon <eladalon@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548388}