Since we now have Renderer methods to query formats for vertex inputs,
we can get rid of the remaining calls to VertexBuffer which we used
to query properties of vertex formats.

Change-Id: I9e57d1d9bf80296aef271877fdd97a16d29114af
Reviewed-on: https://chromium-review.googlesource.com/184522Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>