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This reverts commit b3b25596.

Reason for revert: Re-enable in M70.

Original change's description:
> cros: Disable new wallpaper picker for M69
> 
> The plan is to ship all tablet features together in M70. This CL will
> be merged to M69 and reverted in M70.
> 
> Bug: 800945
> Change-Id: I8ca2adb4b8b0c1715d7229f48bb521d0dd3ed35b
> Reviewed-on: https://chromium-review.googlesource.com/1198523
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#587898}

TBR=xiyuan@chromium.org,wzang@chromium.org

Change-Id: Iaf353081adb041d9b5df6aee2642e6cfa8e092ec
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 800945
Reviewed-on: https://chromium-review.googlesource.com/1198487Reviewed-by: Wenzhao (Colin) Zang <wzang@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587905}