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This CL converts ReportingServiceProxyPtr in blink and
ReportingServiceProxyRequest in content to the new Mojo types.

Bug: 955171, 978694
Change-Id: Ied46648763bb6557220fd74f2c12440ab27bbad7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1776143Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#692314}