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This matches the behavior when the URL is not supported by download.

Bug: 1157808
Change-Id: I5300adefc2d4f8e90c2345d0aacb38514ba55d11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616481
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841328}