GitLab

Delete prerender browsertests that verify referrer policy and add
equivalent tests to NoStatePrefetch.

Please see this spreadsheet for details:
https://docs.google.com/spreadsheets/d/1LFPB4UhPWQkBRz481lz49zmS25znhjSDUtagtTTSPQo/edit?usp=sharing

Bug: 898955
Change-Id: I33e5fb9738abee2d5103c26d9ea0c345e0aa1213
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299231
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789981}