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This reverts commit f933e705.

Reason for revert: Broke compile on Google Chrome ChromeOS bot: https://ci.chromium.org/buildbot/chromium.chrome/Google%20Chrome%20ChromeOS/55439

Original change's description:
> Chrome OS: Add Discover window UI.
> 
> This CL adds Chrome OS Discover UI in separate window.
> 
> Window need further changes to match the specs, but this
> change mostly adds infrastructure.
> 
> Bug: 864686
> 
> Change-Id: I2834d8f9efb3660050a31768508992acb1f3f262
> Reviewed-on: https://chromium-review.googlesource.com/1182880
> Commit-Queue: Alexander Alekseev <alemate@chromium.org>
> Reviewed-by: Ilya Sherman <isherman@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#586034}

TBR=xiyuan@chromium.org,isherman@chromium.org,alemate@chromium.org

Change-Id: Idaaf3bf2adf129d746de7a466d9c433ed52b41c8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 864686
Reviewed-on: https://chromium-review.googlesource.com/1189032Reviewed-by: Scott Little <sclittle@chromium.org>
Commit-Queue: Scott Little <sclittle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586044}