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Previously, the user had to click on the header button to expand or
collapse the section.

This CL makes it so they can click anywhere on the row.

This only affects the Views omnibox, and the NTP realbox, both on
Desktop.

Android already works like this, so it needs no further work.

Bug: 1113341c
Change-Id: I64de6db54ee63de3d428de69aa23c2759effe1cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340266
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795713}