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The [Badging API](https://wicg.github.io/badging/) is a new API
allowing the setting of application/document badges. This change
converts the Badging API web tests into Web Platform Tests.

This change adds a no-op MockBadgeService to the content_shell.
This is necessary because the RenderProcessHostImpl will terminate
the render process if unknown Mojo messages are received.

Bug: 1051684
Change-Id: I61e29b8f197a754fea489ebb2d0dcd41484f6cf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088297Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#754676}