Remove context id serialization
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 <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Cody Northrop <94770d7fe1cce6ea0791fa9927c1107de4d2e37b@google.com>
Commit-Queue: Manh Nguyen <7c79ef580b4d963b83ede739cb9e40f930bcb4c9@google.com>

ppy/angle,ppy/angle,ppy/angle,ppy/angle