[Sync::USS] Update ShouldGetAllDataForDebuggingWithHiddenPassword test

This CL updates ShouldGetAllDataForDebuggingWithHiddenPassword test
in PasswordSyncBridgeTest to make sure it doesn't pass if the bridge
returns an empty batch.

Bug: 902349
Change-Id: I089c2e6a7be3487c9b19d39896fcea5503ab74f6
Reviewed-on: https://chromium-review.googlesource.com/c/1439539
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626934}
1 file changed