[Extensions] Update shortcuts provider test to use manifest v2

Update shortcuts_provider_extension_unittest.cc to generate extensions
using manifest_version 2.

Bug: 816679
Change-Id: I1d895e66c6ebadff948ff78690d1130fbc725f4f
Reviewed-on: https://chromium-review.googlesource.com/1008603
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549985}
1 file changed