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This CL comes with a behavior change: set_allow_credentials(false)
additionally sets LOAD_DO_NOT_SEND_AUTH_DATA. However, this would only
matter if the origin server actually used HTTP auth.

Bug: 799935
Change-Id: I764586d72b69c1a24d4981a4a5ba1127bf4e91aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752622
Commit-Queue: David Benjamin <davidben@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686556}