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This CL adds NetworkIsolationKey as an argument to H2-support-checking
methods in HttpServerProperties, and makes consumers pass in the correct
key.

Bug: 969890
Change-Id: I8ea06693a470eef3ca24ec8d269ce5ac131e312f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1753807Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688607}