GitLab

This CL converts ThreatReporterPtr and
ThreatReporterRequest to new Mojo types
using Remote, PendingRemote, PendingReceiver,
Receiver, and ReceiverSet.

Bug: 955171
Change-Id: I2bc837a87621763a7ee6604265296e63c0eef339
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816200Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#699236}