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Multiple test fixtures set the TestAppRegistrar explicitly
via TestWebAppProvider::SetRegistrar()
and TestAppRegistrar is a type unrelated to WebAppRegistrar.

Later we will get rid of TestAppRegistrar everywhere:
that is a third type of registry
(in addition to BookmarkApps and WebApps).

Replacing it with TestWebAppRegistryController is a separate
follow up task.

Bug: 1082881
Change-Id: I7d59f10360f766fccbc888b8c461aefe27b0cdde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215078
Auto-Submit: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772470}