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This removes Web Store Widget app code, and with it, the whole
components/chrome_apps dir (which currently contains only the
app in question).

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 (and has been moved alongside other
Files app resources), 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.


BUG=1288076

Change-Id: I1818a9fcce6f4bf9fc9877158ba839b22d825fb4
Reviewed-on: https://chromium-review.googlesource.com/c/1291839Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601827}