Remove context id serialization Serializing context id causes many tests to fail capture replay test. Remove it from the the GL context state's serialization. Bug: angleproject:4817 Change-Id: Ide04f24c54d1f1fced532e49e85c0c2970816f5e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2323645 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Manh Nguyen <nguyenmh@google.com>