Use std::make_unique<> in chrome/browser/ui/

Replaces .reset(new ...) with = std::make_unique<...> to avoid manual
use of new.

Bug: chromium:996915
Change-Id: I7d131b6a6849a64a09c1d6946f1908b1022a0173
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1766741
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Dana Fried <dfried@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689764}
163 files changed