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This was something that we wanted to do after the omnibox UI refresh,
which happened last year. Now, we don't need the
AutocompleteTextFieldDelegate or the NSNotifications in
OmniboxViewController.

Bug: 866446
Change-Id: I674bcdb65baecace0b22f6494545985deb22b47a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866632Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#709027}