https://chromiumdash.appspot.com/commit/e6599ea442cd1f91cdc433bfc6c62d30f2b9eae4
https://chromeperf.appspot.com/report?sid=78f26fbfc25ce8003b4456cb362e99d841fe7b564ae220dca538df0d577ff5c9

It is broken since the CL.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/42c36492918de3cffb013792fb41cc8537b7e1f5

commit 42c36492918de3cffb013792fb41cc8537b7e1f5
Author: Emircan Uysaler <emircan@chromium.org>
Date: Mon Apr 30 20:03:28 2018

Update webrtc smoothness metric category

These categories were renamed in a previous CL. This fix the corresponding
telemetry test.

Bug:  837881 
Change-Id: I0c769add6d9a78ce1364983ed5bb70ac0d644ee0
Reviewed-on: https://chromium-review.googlesource.com/1034119
Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554855}
[modify] https://crrev.com/42c36492918de3cffb013792fb41cc8537b7e1f5/tools/perf/benchmarks/webrtc.py

[bulk-edit: disregard if N/A] Can the owner please set milestone to this bug if applicable?