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This reverts commit b4603176.

Reason for revert: Reverting as one of the fixs for an interactive_ui_test failure got reverted.

Original change's description:
> Adds WindowService-ChromeOS fieldtrial
> 
> I'm not sure on the name here. I went with WindowService-ChromeOS as
> at some point we will launch the WindowService on other platforms, but
> that won't be anytime soon and is likely to be very different. So, I'm
> thinking later on we have the field trial WindowService-Desktop.
> 
> BUG=814898
> TEST=none
> 
> Change-Id: I5bf45c2a463de0fefaeb06939429977e36c3681e
> Reviewed-on: https://chromium-review.googlesource.com/932821
> Commit-Queue: Scott Violet <sky@chromium.org>
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#542680}

TBR=sky@chromium.org,rkaplow@chromium.org

Change-Id: Id63c00a90c6fd05ff74f0ffaa6ed738a98bd74e3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 814898
Reviewed-on: https://chromium-review.googlesource.com/959763Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542713}