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This CL polishes the comment for transient flag in DownloadUrlParameters.

Change-Id: I06732268dc08889cc195b61d3140560acc9e5242
Reviewed-on: https://chromium-review.googlesource.com/c/1357380Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612765}