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This code is currently in content/browser/loader but is useful to other
features.

Bug: 1012869
Change-Id: Ie129d975d0d381f2ec8e98670efc8ed52c39d40a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848055Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704734}