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This subpage only exists in OS settings under apps, so move it into
//chrome/browser/resources/settings/chromeos/os_apps_page/

Browser settings still needs to use AndroidAppsBrowserProxy for the
protocol handlers page.

Fixed: 1034722
Change-Id: Ia67bbb61ac847f0124ee5170c5c0ec2facae0b33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974532
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726264}