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This change is a followup to
https://chromium-review.googlesource.com/c/chromium/src/+/870313. It
changes the RemoteSuggestionsFetcherImpl unittest to use
IdentityTestEnvironment now that the production code is using
IdentityManager.

This CL also adds an API to IdentityTestEnvironment that is needed for
the conversion.

Bug: 798413
Change-Id: Ie2ec495c32d86130ee93bdb56b92de9cf93f9500
Reviewed-on: https://chromium-review.googlesource.com/870594
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530475}