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As with WebView, the client is responsible for handling download
requests. The Android shell client simply uses Android's
DownloadManager.

Bug: none
Change-Id: I0204a2101f675c35682f0c75cbe34a506c7b5e2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862121
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707177}