D3D11: Move the swizzle format set into ANGLEFormatSet. The only piece of data left in the d3d11::TextureFormat is the initializer function, which could just as easily be in the ANGLEFormatSet. BUG=angleproject:1455 Change-Id: Iee8eb84f71807575c2a46bf4fcbf283aa1b7f565 Reviewed-on: https://chromium-review.googlesource.com/367090 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Zhenyao Mo <zmo@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>