+allada since it might be related to the changes in Network.

looks like a recent regression.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/273f0908bb5fe23363e686201ac0e6c86d0601a7

commit 273f0908bb5fe23363e686201ac0e6c86d0601a7
Author: alph <alph@chromium.org>
Date: Tue Dec 06 19:06:57 2016

Revert of [Devtools] Fixed flakey network-columns-sorted.html test (patchset #1 id:1 of https://codereview.chromium.org/2542553002/ )

Reason for revert:
Broke timeline tree view.
BUG= 671487 

Original issue's description:
> [Devtools] Fixed flakey network-columns-sorted.html test
>
> Fixes recently added flakey test.
>
> R=dgozman,lushnikov
> BUG= 669753 
>
> Committed: https://crrev.com/82ef6cfd810f4acb06a7aafc598fefc806773b12
> Cr-Commit-Position: refs/heads/master@{#435391}

TBR=dgozman@chromium.org,lushnikov@chromium.org,allada@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG= 669753 
NOTRY=true

Review-Url: https://codereview.chromium.org/2554093003
Cr-Commit-Position: refs/heads/master@{#436674}

[modify] https://crrev.com/273f0908bb5fe23363e686201ac0e6c86d0601a7/third_party/WebKit/LayoutTests/http/tests/inspector/network/network-columns-sorted-expected.txt
[modify] https://crrev.com/273f0908bb5fe23363e686201ac0e6c86d0601a7/third_party/WebKit/LayoutTests/http/tests/inspector/network/network-columns-sorted.html

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6c2f9ee53faefc6bfd70834df9cfb794412eb425

commit 6c2f9ee53faefc6bfd70834df9cfb794412eb425
Author: alph <alph@chromium.org>
Date: Tue Dec 06 23:21:01 2016

Revert of [Devtools] Moved flatten children to children nodes instead of datagrid (patchset #4 id:100001 of https://codereview.chromium.org/2540543002/ )

Reason for revert:
Broke timeline tree view.
BUG= 671487 

Original issue's description:
> [Devtools] Moved flatten children to children nodes instead of datagrid
>
> This patch moves the flattenNodeList() and renames it flattenChildren() to
> be more appropriate. It is also moves it to the nodes instead of the
> DataGrid.
>
> R=dgozman
> BUG=None
>
> Committed: https://crrev.com/9d0774bc242a8126f10c9be7922549336162ed88
> Cr-Commit-Position: refs/heads/master@{#434901}

TBR=dgozman@chromium.org,allada@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=None

Review-Url: https://codereview.chromium.org/2554753004
Cr-Commit-Position: refs/heads/master@{#436770}

[delete] https://crrev.com/ab650bf37d14c76a794fe42f7cd0739dc01b752a/third_party/WebKit/LayoutTests/http/tests/inspector/network/network-columns-sorted-expected.txt
[delete] https://crrev.com/ab650bf37d14c76a794fe42f7cd0739dc01b752a/third_party/WebKit/LayoutTests/http/tests/inspector/network/network-columns-sorted.html
[modify] https://crrev.com/6c2f9ee53faefc6bfd70834df9cfb794412eb425/third_party/WebKit/LayoutTests/inspector/components/viewport-datagrid-expected.txt
[modify] https://crrev.com/6c2f9ee53faefc6bfd70834df9cfb794412eb425/third_party/WebKit/LayoutTests/inspector/components/viewport-datagrid.html
[modify] https://crrev.com/6c2f9ee53faefc6bfd70834df9cfb794412eb425/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
[modify] https://crrev.com/6c2f9ee53faefc6bfd70834df9cfb794412eb425/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
[modify] https://crrev.com/6c2f9ee53faefc6bfd70834df9cfb794412eb425/third_party/WebKit/Source/devtools/front_end/ui_lazy/SortableDataGrid.js
[modify] https://crrev.com/6c2f9ee53faefc6bfd70834df9cfb794412eb425/third_party/WebKit/Source/devtools/front_end/ui_lazy/ViewportDataGrid.js