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A unit test only for compiling MockDownloadItem is not needed.

Bug: NONE
Change-Id: I106c2a9a5bacad516373905df1d4e8141ff1c441
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250930
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779558}