Revert "Reland "Remove jni_zero type aliases in jni_generator_helper.h.""

This reverts commit 4f3d660f4f28a1dcdb577ab89d57830083ac883a.

Reason for revert: downstream still broken

Original change's description:
> Reland "Remove jni_zero type aliases in jni_generator_helper.h."
>
> This is a reland of commit 9fcaa034bc032da9de5d6fcdd45528169f44d343
>
> Original change's description:
> > Remove jni_zero type aliases in jni_generator_helper.h.
> >
> > This CL removes some type alias from
> > sdk/android/src/jni/jni_generator_helper.h and make sure all the
> > jni_zero types are referred to using the jni_zero:: namespace.
> >
> > The goal is to remove sdk/android/src/jni/jni_generator_helper.h
> > in future CLs.
> >
> > Bug: b/319078685, b/351773023
> > Change-Id: Ief60fce3e8f301f09ac5392d143aa5a82a445bcb
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/356882
> > Reviewed-by: Zoé Lepaul <xalep@webrtc.org>
> > Reviewed-by: Jeremy Leconte <jleconte@google.com>
> > Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
> > Cr-Commit-Position: refs/heads/main@{#42618}
>
> Bug: b/319078685, b/351773023
> Change-Id: I604b0842d220d76c36b73d2d49bcefe0ee7ae14f
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/356903
> Commit-Queue: Jeremy Leconte <jleconte@google.com>
> Reviewed-by: Zoé Lepaul <xalep@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#42626}

Bug: b/319078685, b/351773023
Change-Id: I9429789e44c82735305b2d0d90cbaa4891d79622
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/357041
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Owners-Override: Jeremy Leconte <jleconte@google.com>
Cr-Commit-Position: refs/heads/main@{#42627}