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The permission RAPPOR metrics have long been supplanted by permission
action reporting metrics (via the safebrowsing service). This patch
removes the RAPPOR logging which we no longer need.

Bug: 605836
Change-Id: Ibdbb394a074d5c1543538a2ffab44617481d2417
Reviewed-on: https://chromium-review.googlesource.com/765561Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516104}