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On iOS 10, where Files app does not exist it is possible for
UIDocumentInteractionController to not present Open In... menu.
In this case Download Manager should show the prompt to install Google
Drive app.

Bug: 823702
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I393c8724186deaefd3dc192a61759c24799dd1d5
Reviewed-on: https://chromium-review.googlesource.com/974748
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545098}