[Omnibox] Enable Chrome Actions on Android by default

This CL is for the launch cl/427224852

Bug: 1287222
Change-Id: I024a2f978f4b0a962763e5096924a2974a8be73c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3603227


Reviewed-by: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Orin Jaworski <orinj@chromium.org>
Commit-Queue: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#995408}