robliao@: Could this be related to https://chromium.googlesource.com/chromium/src.git/+/59da623a9597b60252f1c657add234eecbb30918 ?

The failures started shortly after that CL, though not immediately (2-3 builds).

Yep. These are bot only failures that need to be investigated on the bot as noted in the CL description.

The work for this was just deprioritized.

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7f6ea60ef53c47383bd2954a8b908c8eecd25f5f

commit 7f6ea60ef53c47383bd2954a8b908c8eecd25f5f
Author: Robert Liao <robliao@chromium.org>
Date: Thu Jun 21 21:17:20 2018

Revert "Add Views DesktopMediaPicker into the Overall Views Build"

This reverts commit 59da623a9597b60252f1c657add234eecbb30918.

Reason for revert: This work was just deprioritized, so the investigation into the bot only failures is now on the backburner.

Original change's description:
> Add Views DesktopMediaPicker into the Overall Views Build
> 
> This moves the code into the toolkit_views source list and gates Aura
> specific code behind build flags.
> 
> Additionally, this links up DesktopMediaPicker::Create in a manner
> similar to ScreenCaptureNotificationUI::Create[Cocoa].
> 
> BUG=726005,657883
> NOAUTOREVERT=true
> Need to investigate any failure on the Mac Bot. Not reproducible locally.
> 
> Change-Id: I9ece0b875268495d70154378c7608c3e1bae2938
> Reviewed-on: https://chromium-review.googlesource.com/1102042
> Commit-Queue: Robert Liao <robliao@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#569095}

TBR=ellyjones@chromium.org,sky@chromium.org,robliao@chromium.org

Change-Id: Ice2800851d19895e687525bc63b8afa9d1746517
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 726005, 657883
Reviewed-on: https://chromium-review.googlesource.com/1110897
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569377}
[modify] https://crrev.com/7f6ea60ef53c47383bd2954a8b908c8eecd25f5f/chrome/browser/ui/BUILD.gn
[delete] https://crrev.com/cb8b61b491aad9c3b36dbfd705d52a7bfc3c2dda/chrome/browser/ui/cocoa/media_picker/create_desktop_media_picker_cocoa.h
[delete] https://crrev.com/cb8b61b491aad9c3b36dbfd705d52a7bfc3c2dda/chrome/browser/ui/cocoa/media_picker/create_desktop_media_picker_cocoa.mm
[modify] https://crrev.com/7f6ea60ef53c47383bd2954a8b908c8eecd25f5f/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm
[modify] https://crrev.com/7f6ea60ef53c47383bd2954a8b908c8eecd25f5f/chrome/browser/ui/views/desktop_capture/desktop_media_list_view.cc
[modify] https://crrev.com/7f6ea60ef53c47383bd2954a8b908c8eecd25f5f/chrome/browser/ui/views/desktop_capture/desktop_media_picker_views.cc
[modify] https://crrev.com/7f6ea60ef53c47383bd2954a8b908c8eecd25f5f/chrome/browser/ui/views/desktop_capture/desktop_media_picker_views_unittest.cc
[modify] https://crrev.com/7f6ea60ef53c47383bd2954a8b908c8eecd25f5f/chrome/test/BUILD.gn