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Some deprecated fields were instead commented out, or prefixed with
"deprecated_". Better to properly remove them, and make sure the tags
aren't accidentally reused.

Bug: 950904
Change-Id: Ibe7515c1658adc2076f775281b5b928bc16687d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820802Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699301}