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This is a refactoring followup to
https://chromium-review.googlesource.com/c/chromium/src/+/1356223/.

Change-Id: Ic92c73908914f49a38cae1192dcf054901018430
Reviewed-on: https://chromium-review.googlesource.com/c/1356134Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612545}