The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d339f305e11fdc08da841c57c632094e7b9786cb

commit d339f305e11fdc08da841c57c632094e7b9786cb
Author: rnephew <rnephew@chromium.org>
Date: Tue Aug 01 06:11:00 2017

[Telemetry] Disable failing loading.mobile nexus5x stories.

Dramaq and Hongkiat have failed many times over the last 20 runs.

TBR=charliea@chromium.org

Bug:  750747 
Change-Id: I6319ce896c77f38ae9bb9411381cea37c4a93f6f
Reviewed-on: https://chromium-review.googlesource.com/594496
Reviewed-by: rnephew <rnephew@chromium.org>
Commit-Queue: rnephew <rnephew@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490878}
[modify] https://crrev.com/d339f305e11fdc08da841c57c632094e7b9786cb/tools/perf/page_sets/loading_mobile.py

This regression has been open for half a year. It's not very actionable and the regression has been in all Chrome user's hands for months.