Enable multidex for chrome_public_test_vr_apk and chrome_sync_shell_apk

They are both close to the dex limit.

Change-Id: Ie5041bca4b4fc3cc56f97351455fa3db29500773
Reviewed-on: https://chromium-review.googlesource.com/1061624
Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559226}
1 file changed