Make RendererD3D a bit smaller. Move some D3D11-specific stuff into Renderer11, and remove a few virtual methods that weren't needed to be virtual. BUG=angleproject:1369 Change-Id: Id37e7271ffc28b089dbea123dca70f38c1a06ffb Reviewed-on: https://chromium-review.googlesource.com/345913 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>