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is makes it less likely that origins will be able to exploit
base::JSONReader using Report-To headers.

Bug: 810142
Change-Id: Ie27d98efe2afbfbeec2e4767e2a64b546e4483d9
Reviewed-on: https://chromium-review.googlesource.com/942231Reviewed-by: Julia Tuttle <juliatuttle@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540395}