[DevTools] prepare test before V8 roll

With one of the next rolls, V8 will no longer force context allocation
of module-scope variables.

Bug: 791334
Change-Id: I93f38c190cc0ee68df4f2834083308b4504a8032
Reviewed-on: https://chromium-review.googlesource.com/822432
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523449}
2 files changed