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The app was used as a wrapper around Web Store Widget UI. The widget
provides way of displaying filtered list of extensions in Chrome Web
Store and is able to request an extension installation. The widget
itself is still used in Files app, but the Web Store Widget component
app, which was used to list printer provider extensions for a printer
when the printer gets plugged in is not used anymore
(https://crbug.com/734161), and can be removed.

This removes APIs specific to the Web Store Widget app, and stops
loading the app in component loader.

A CL that removes the app implementation itself will follow.

BUG=839992

Change-Id: I06a71ed1527ea41ac6b464c1cad1a7a7279e753f
Reviewed-on: https://chromium-review.googlesource.com/c/1289439
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601232}