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The gfx::AcceleratedWidget StructTraits had it passed by reference
instead of value. The underlying type is always a primitive so it should
be passed by value. Update StructTraits and mojom implementations.

Change the StructTraits implementation to fail deserialization for
platforms that don't support sending AcceleratedWidgets over IPC. Also
change StructTraits unittest not to need a test interface, directly
serialize and then deserialize instead.

Bug: none
Change-Id: Iee82df75d248fe48f5478ca5251a08238707758e
Reviewed-on: https://chromium-review.googlesource.com/1110023Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569315}