[Extensions] Update ExtensionWebstorePrivateApiTest to manifest v2

Update ExtensionWebstorePrivateApiTest to manifest v2 and remove the
allowance for manifest v1 extensions.

Repackage two crx's used in the webstorePrivate API tests to be
updated to manifest v2.

Bug: 816679

Change-Id: I8ba99179c99b62c6ef49cf3aa8e7afab7dfacdf5
Reviewed-on: https://chromium-review.googlesource.com/1015081
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551813}
3 files changed