Remove tes31Context_override.cpp This override file was originally added to prevent the creation of a GLES 3.2 context. However, it was later removed from the build configs. It should now be possible to remove this file completely. * Removed the file from deqp_support. Bug: angleproject:42262344 Change-Id: Ib60fbf609b92cd03c10056d6bba4e253fc19b96c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5602269 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Yuxin Hu <yuxinhu@google.com> Commit-Queue: Amirali Abdolrashidi <abdolrashidi@google.com>