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This variable has always existed as |select_all|, but it's real meaning
is essentially |is_user_initiated|. This CL renames the parameter to
that new name, and plumbs it into OmniboxView.

It doesn't use that parameter yet. This CL has no behavior changes,
just an API change.

The followup CL will use this new parameter to prevent triggering
on-focus suggestions for renderer-initiated omnibox focuses.
Most notably, this prevents browser startup NTP load from triggering
on-focus suggestions.

TBR=aboxhall@chromium.org

Bug: 1013287, 996516
Change-Id: I9461ea6a9c925b163aed5708109f5f7caa00f0c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865616
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707023}