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This CL just updates enums.xml's definition of ChromeDownloadSource to
match the one in the code.

Change-Id: I0160d8986f6c542f58bac2891b55089d7f6e6a99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891016
Auto-Submit: Joe DeBlasio <jdeblasio@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710932}