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This reverts commit 67fc091c.

Reason for reland: Writing both build_vars.json & build_vars.txt

Original change's description:
> Revert "build_vars.txt: Changed to build_vars.json"
>
> This reverts commit 6e002e1f.
>
> Reason for revert: Official build failure crbug.com/1114609
>
> Original change's description:
> > build_vars.txt: Changed to build_vars.json
> >
> > And moved helper function into gn_helpers.py
> >
> > It was only ever in .properties format so that it
> > could be easily parsed by bash, but we no longer need
> > that.
> >
> > Also fixes default_android_sdk_version to be a string.
> > -next builds need it to be a string.
> >
> > Bug: None
> > Change-Id: I99541f18510de93dae4c0d68b734638564f74ee2
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340673
> > Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> > Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
> > Reviewed-by: Dirk Pranke <dpranke@google.com>
> > Cr-Commit-Position: refs/heads/master@{#796020}
>
> TBR=dpranke@google.com,agrieve@chromium.org,mheikal@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: None
> Change-Id: Iad8597f6af00c534245fd1a40d1809d952758f47
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2344626
> Reviewed-by: Ben Mason <benmason@chromium.org>
> Commit-Queue: Ben Mason <benmason@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#796387}

Bug: 1114750
Change-Id: I1019351a294e54701c093911f67a1fb6b7bd34d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346965Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796456}