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Version 99 is adopting HTTP/3 priority, which is different from H2 priority.

After this CL, no priority related stuff will be sent on headers stream any more.

Change-Id: I00aab1b9daf5bc288b0afde3211d169bcd92f6e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1710850Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680148}