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Fix usb_host mojom connection error when OpenDeivce is rejected.

When app call OpenDevice from Android side, it can be rejected because
1. app has not requested for permission.
2. permission_broker decides the node is in use.
In these cases we return mojo::ScopedHandle() from Chrome to Android.
And case cause mojom connection error.

connection error.

Test: return mojo::ScopedHandle() to OpenDeivce and no more mojom
Bug: 922675
Change-Id: I1de5eb17cca35d57f96afc7d10de6312659253b9
Reviewed-on: https://chromium-review.googlesource.com/c/1416132Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Commit-Queue: Long Cheng <lgcheng@google.com>
Cr-Commit-Position: refs/heads/master@{#634766}