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Make sure all users of an input bus increment the ref count by using
scoped_refptr instead of a raw pointer to the bus so that lifetime
is managed correctly.  We only handle the input bus in this CL.

Bug: 1040246
Change-Id: Ib93299da51e6eafbf9a7d0e433e1beea8fe9c266
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1958616
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738021}