GitLab

Move the ExtensionApiTest class into the extensions namespace, and
updated affected sites.

This CL should have no functional change.

Bug: 117261
TBR=thestig@chromium.org (/chrome)
TBR=dmazzoni@chromium.org (/third_party/liblouis)

Change-Id: Ibd8820f47ebe53140fd725fb00b1d75c9872808c
Reviewed-on: https://chromium-review.googlesource.com/1050580
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558534}