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This CL removes UserManager::Get()(for ephemeral user check) out from
WallpaperManager::SaveUserWallpaperProperties(called when initializing UserManager).
It was creating a deadlock and make chrome hang on startup screen.

The ephemeral user check in SaveUserWallpaperProperties is not correct either.
We should not check if current logged in user is ephemeral user while we try
to save wallpaper properties for some other user specified by email.

BUG=142440

Review URL: https://chromiumcodereview.appspot.com/10829381

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152136 0039d316-1c4b-4281-b951-d872f2087c98