GitLab

Name various test extensions used in integration test consistently, in
particular, the test extensions used in the providers.js tests [1].

[1] these are the only integration testcases that explicitly depend on
test extension manifest name. Add a helper to return the name.

Bug: 869240
Change-Id: I9d5ab74af9083201ab2c0173c2e505ec6f6e05be
Reviewed-on: https://chromium-review.googlesource.com/1154784Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579316}