Remove the dds_to_header sample. It has very little to do with ANGLE and should not be in the repository. BUG=angleproject:981 Change-Id: I7aa97b8f56b49beda591e90afcffcb27619beaec Reviewed-on: https://chromium-review.googlesource.com/266870 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Brandon Jones <bajones@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>