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The only file remaining in the directory is
|wallpaper_manager_policy_browsertest.cc|, and these tests mainly test
the code path in |chrome_user_manager_impl|, so it makes sense to put
them together.

//ash/wallpaper does not rely on these tests. There's sufficient test
coverage in //ash for user policy and device policy wallpapers already.

In addition, remove //ash dependency to make it work under Mash.

Bug: NONE
Test: browser_tests
Change-Id: I187e9d34c69cfc63c8119c05886f96274a41dc8c
Reviewed-on: https://chromium-review.googlesource.com/978838Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545663}