This reverts commit b2e76cf5.

Reason for revert: Causing MSan failures on Linux. See bug.

Bug: chromium:1191344

Original change's description:
> Save/Load missing members
>
> There are several class/struct members that are missing when a program
> is serialized/deserialized. This leads to errors when attempting to link
> programs that have been deserialized. For example, when drawing with a
> PPO that contains programs which were created with glProgramBinary().
>
> This CL adds saving/loading the missing members.
>
> Bug: b/182409935
> Change-Id: I637c6cd8c174acd6da8d51433893323a32e5d7c0
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2770683
> Commit-Queue: Tim Van Patten <timvp@google.com>
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
> Reviewed-by: Cody Northrop <cnorthrop@google.com>

Bug: b/182409935
Change-Id: I1209257ed6bb55ba2d01d92bd3305d5e3ad6ee28
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2780015Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>