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Reland "Ensure header modification for a redirect's onBeforeSendHeaders is applied with network service."

This is a reland of b5e1969b

Original change's description:
> Ensure header modification for a redirect's onBeforeSendHeaders is applied with network service.
>
> This currently worked if 'extraHeaders' was specified, but not without it.
>
> Bug: 942062
> Change-Id: Ic962ad256d89384082e25a5983181bf563021ffb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1548673
> Commit-Queue: John Abd-El-Malek <jam@chromium.org>
> Reviewed-by: Ken Rockot <rockot@google.com>
> Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#647160}

TBR=rockot@chromium.org

Bug: 942062, 949478
Change-Id: I11889f6c2973548b28e3ea8029f1516626c950f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559013Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Auto-Submit: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649768}