GitLab

Update references to ExtensionService in c/b/notifications to use
extensions::ExtensionService.

There should be no behavior change as a result of this CL.

Bug: 117261
Change-Id: Ie3133eeb0a9778c909420b3f531e2d34d4270686
Reviewed-on: https://chromium-review.googlesource.com/1079901Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563044}