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This is so WebLayer can reuse this code to support NoStatePrefetch.

Bug: 1096088
Change-Id: Iead866201c684f3e349c67703171630508eb6c6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336599
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795214}