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This updates the Reporting implementation to include the naming
changes in https://github.com/WICG/reporting/issues/72.

Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I2446a8baaf512760949ac5bcaae56088def7d600
Reviewed-on: https://chromium-review.googlesource.com/1073060
Commit-Queue: Douglas Creager <dcreager@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567990}