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Remove WallpaperUserInfo (see PS1 for use of UserInfo instead).
Pass AccountIds to WallpaperController instead of structs.
Encapsulate lookup of the user type and ephemeral flag.

Remove now-unused ephemeral flag from OnlineWallpaperParams.
Remove InitializeUser test helper and inline Clear* as needed.
Add optional user type argument to SimulateUserLogin.

Bug: 958227
Test: No wallpaper regressions.
Change-Id: I768e6ac748faa008f7947839d56c2ce7e75be1bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648749Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Auto-Submit: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668452}