I've seen discourse_infinite_scroll flakily fail more than once on trybots, and not just on windows (https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_rel_ng/builds/468678 for instance).

Sorry about that, I will disable discourse_infinite_scroll on Linux as well

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/69926dfb4a6c6147ea5eabe5d841857ef5980885

commit 69926dfb4a6c6147ea5eabe5d841857ef5980885
Author: nednguyen <nednguyen@google.com>
Date: Wed May 31 23:57:33 2017

Disable browse:tech:discourse_infinite_scroll on Linux

BUG= 728152 
TBR=ulan@chromium.org, perezju@chromium.org

Review-Url: https://codereview.chromium.org/2920623002
Cr-Commit-Position: refs/heads/master@{#476100}

[modify] https://crrev.com/69926dfb4a6c6147ea5eabe5d841857ef5980885/tools/perf/page_sets/system_health/browsing_stories.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9455657598e1cc7184438e1fde94ca254ccde946

commit 9455657598e1cc7184438e1fde94ca254ccde946
Author: nednguyen <nednguyen@google.com>
Date: Mon Jul 10 15:49:34 2017

[system_health] Reenable facebook_infinite_scroll

TBR=perezju@chromium.org, ulan@chromium.org

Bug:  728152 
Change-Id: I5b71e3b844c11a51dedc6be291885762ad373a0a
Reviewed-on: https://chromium-review.googlesource.com/565184
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#485279}
[modify] https://crrev.com/9455657598e1cc7184438e1fde94ca254ccde946/tools/perf/page_sets/system_health/expectations.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/78fb4874bbf88167ca07d43ca7bb9afe3a4861f7

commit 78fb4874bbf88167ca07d43ca7bb9afe3a4861f7
Author: nednguyen <nednguyen@google.com>
Date: Mon Jul 10 19:18:49 2017

[system_health] reenable browse:tech:discourse_infinite_scroll story

TBR=perezju@chromium.org, ulan@chromium.org

Bug:  728152 
Change-Id: I667868293666de8580b69a6387fe5c8c7a63b7fa
Reviewed-on: https://chromium-review.googlesource.com/565102
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#485341}
[modify] https://crrev.com/78fb4874bbf88167ca07d43ca7bb9afe3a4861f7/tools/perf/page_sets/system_health/expectations.py

No complaints from chromium sheriff so far, so I think this is fixed :P