[Extensions] Update ExtensionCrxInstallerTest to manifest v2

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

Update good.crx, good_v1.crx, and good2.crx to be manifest v2
extensions. Add directories for good_unpacked, good2_unpacked, and
good_v1 in order to allow easy repackaging of these extensions in the
future.

Keep the old good.crx as legacy_crx_package.crx, since it's still useful
in the mime type sniffing test.

Bug: 816679
Change-Id: I7c286e037ee6225db14603074f411c2c6260a3f8
Reviewed-on: https://chromium-review.googlesource.com/1015968
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552263}
17 files changed