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Revert of Revert "Update legacy Tuple-using code." (patchset #1 id:1 of https://codereview.chromium.org/826573002/)

Reason for revert:
The tests should have failed with this. Undoing the revert.

Original issue's description:
> Revert "Update legacy Tuple-using code."
>
> This reverts commit 12f4b983
>
> BUG=440675, 444827
>
> Committed: https://chromium.googlesource.com/chromium/src/+/85748694f2a119a057088f77f70b97f11607473c

TBR=
NOTREECHECKS=true
NOTRY=true
BUG=440675, 444827

Review URL: https://codereview.chromium.org/794073003

Cr-Commit-Position: refs/heads/master@{#309586}