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Devlin Cronin authoredSome extension browser tests generate extension objects at runtime. Update these to generate extensions with manifest_version: 2. Where it wasn't already used, also update these to use ExtensionBuilder, which uses manifest v2 by default. Bug: 816679 Bug: 756488 Change-Id: I7142d085ad9569dccd4e9b62e09c7a68da08e360 Reviewed-on: https://chromium-review.googlesource.com/1008633Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org> Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org> Cr-Commit-Position: refs/heads/master@{#550113} cbc15a3a