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Before, if there were suggestions on the NTP, they would immediately
appear. The better animation is to scroll the fakebox up to the top
of the screen and then present the suggestions.

To do this, when entering the omnibox from NTP, we only focus the
location bar, which causes the scrolling animation. -fakeboxFocused
is already called in the animation completion block, which does the
actual work to make the omnibox text field first responder, causing the
suggestions to appear.

To finish off, the -locationBarDidBecomeFirstResponder code now only
focuses the location bar if we are not on the regular NTP.

Bug: 1057643
Change-Id: I472ee1ee5693fa4102717275bf266f4ab97e121a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082556
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746450}