Also moves the logic of the constant buffer sync to
StateManager11. Removes a few of the remaining virtual methods in
RendererD3D.

BUG=angleproject:1390
BUG=angleproject:2052

Change-Id: Ia6c1c3949fff84323331510d80bbfb6e1665d294
Reviewed-on: https://chromium-review.googlesource.com/659226
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>