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Similar to crrev.com/c/2352268, accessing browser context in weblayer
seems to initialize BackgroundFetchContext, which depends on
ServiceWorkerStorage::GetUserDataForAllRegistrationsByKeyPrefix().
Tests should wait for the completion of
GetUserDataForAllRegistrationsByKeyPrefix() to avoid hitting DCHECK()
in mojo generated bindings.

Bug: 1115172
Change-Id: I5836e962cd35f07ab46e20b64352f8ef8eb9f353
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368652Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800466}