Remove getSamplerStateWithNativeOffset. This method returned a sampler state as normal, with the base level automatically offset by the one or two levels we use in the D3D workaround for small compressed textures. Since this is D3D-only, we can move all of the logic into the D3D classes themselves. BUG=angle:781 Change-Id: Ie0a60877efebb41f02f4e57625a44e5fb5cce074 Reviewed-on: https://chromium-review.googlesource.com/222923 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Brandon Jones <bajones@chromium.org>