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ExternalInstallErrorTests have been updated to manifest v2.
Remove the allowance for manifest v1 extensions.

Bug: 816679
Change-Id: I59bcbcaf0d1d15e6270e485398091f3e714f217b
Reviewed-on: https://chromium-review.googlesource.com/1024609Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553394}