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Now that PendingBookmarkAppManager doesn't access ExtensionRegistry and
ExtensionPrefs directly for installations, we can avoid faking some cases
in tests.

PendingBookmarkAppManager still uses ExtensionRegistry for
uninstallations so we still need to fake some calls to it. Once
we abstract uninstallation, we can remove all usage of ExtensionRegistry
from tests.

Bug: 916381
Change-Id: Ied92df67f8cb6ab7d07ffa5ea64b487e5d50d6e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1502258
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638389}