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Fixes flakiness in ShouldSaveAndDeleteImageOnDisk
Add brief delay to TestAmbientURLLoaderImpl
Re-order expectations to avoid races

Bug: b/160720485
Change-Id: I8be82e924d592024b972c4f13a8300418a39dc3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300008
Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789513}