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Currently, when we restore focus to the omnibox by merely switching the
window (Alt+Tab), we trigger on focus suggestions. This is not good.

This CL does two things:
 1) Fixes FocusManager so that it provides the correct |reason| for
    restoring the focus to Views.
 2) Modifies OmniboxViewViews and OmniboxEditModel to only trigger
    on-focus suggestions for DIRECT focus events, and not RESTORE
    events.

Bug: 1013287, 996516
Change-Id: I885162f29b43b052b3251f02c22c37c047a1bf64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865621Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708229}