cros: WallpaperControllerTest should use ScopedTempDir
The flakiness is not related to RunUntilIdle(), but is because ScopedTempDir is not used for custom or online wallpapers: the tests do lots of operations on the directories, so we should make sure they are unique to avoid affecting each other. Bug: 823760, 823762 Test: ash_unittests (Run all tests together) Change-Id: I9cf6a70a4cfc146c8a0b91ed4cf2860dbc72394f Reviewed-on: https://chromium-review.googlesource.com/1252981 Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org> Reviewed-by:James Cook <jamescook@chromium.org> Cr-Commit-Position: refs/heads/master@{#595308}
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