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Pass to InMemoryURLIndex a pointer to the owning HistoryService and
remove the reference to Profile that is no longer necessary.

Fix the unit tests to no longer pass the Profile, and to call the
Shutdown method before destroying the object so that it properly
remove itself from the HistoryService observer list.

BUG=370850

Review URL: https://codereview.chromium.org/879763002

Cr-Commit-Position: refs/heads/master@{#313485}