[DevTools] Use no-referrer for DevTools links

Bug: 732751
Change-Id: I77753120e2424203dedcc7bc0847fb67f87fe2b2
Reviewed-on: https://chromium-review.googlesource.com/615021
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494413}