Reland #2 "JNI Zero: Expose empty String, List, Map as constants"

This reverts commit a9e07e04cb0112c14c8380e8887dabb2192e18e9.

Reason for reland: Cronet is fixed.

Original change's description:
> Revert "Reland "JNI Zero: Expose empty String, List, Map as constants""
>
> This reverts commit b1dbbe886029587cf097800357e5f82c4f4609f2.
>
> Reason for revert: blocking webrtc roll. Can reland after fixing cronet
>     jni_zero renaming see https://crbug.com/353534209
>
> Original change's description:
> > Reland "JNI Zero: Expose empty String, List, Map as constants"
> >
> > This reverts commit 8f836238c12fbf5bf0c9858f2c0a209e6874012e.
> >
> > Reason for reland: Renaming a target to fix incremental builds
> >
> > Original change's description:
> > > Revert "JNI Zero: Expose empty String, List, Map as constants"
> > >
> > > This reverts commit e4259e1fc57fdbb88111021a57dede285f4a15e5.
> > >
> > > Reason for revert: Broke local build
> > >
> > > Original change's description:
> > > > JNI Zero: Expose empty String, List, Map as constants
> > > >
> > > > AFAICT, ART allocates a new empty string object each time you call
> > > > env->NewString*() methods. Same with List and Map.
> > > >
> > > > To avoid allocations for empty things, use these singletons in
> > > > conversion functions.
> > > >
> > > > This adds a new JavaRef type: LeakedJavaGlobalRef, which is the same as
> > > > ScopedJavaGlobalRef, except without a destructor.
> > > >
> > > > Bug: None
> > > > Change-Id: Id87e7e7a8c7a8219e237d15a37ade582768383d0
> > > > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5645747
> > > > Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
> > > > Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> > > > Owners-Override: Andrew Grieve <agrieve@chromium.org>
> > > > Reviewed-by: Sam Maier <smaier@chromium.org>
> > > > Cr-Commit-Position: refs/heads/main@{#1319347}
> > >
> > > Bug: None
> > > Change-Id: I101ea04150b33e2c8b9ac857466aa886365aea05
> > > No-Presubmit: true
> > > No-Tree-Checks: true
> > > No-Try: true
> > > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5656590
> > > Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
> > > Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> > > Owners-Override: Wenyu Fu <wenyufu@chromium.org>
> > > Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
> > > Reviewed-by: Wenyu Fu <wenyufu@chromium.org>
> > > Cr-Commit-Position: refs/heads/main@{#1319417}
> >
> > Bug: None
> > Change-Id: Ica1c0a14d6eb1027ae8bd674409c0d9f34c768fc
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5662098
> > Owners-Override: Andrew Grieve <agrieve@chromium.org>
> > Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
> > Auto-Submit: Andrew Grieve <agrieve@chromium.org>
> > Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> > Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1320367}
>
> Bug: 351773023, 353534209
> Change-Id: I71507dd091b3d332c43e094b1ea358669bfe7ae4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5769676
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Auto-Submit: Mohamed Heikal <mheikal@chromium.org>
> Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> Owners-Override: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1338722}

Bug: 351773023, 353534209
Change-Id: I1893d044a5ced80dec2c7b96b56c23449bb2dd1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6062739
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Owners-Override: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1408790}