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instead of dependent_stream_id to match the language in the HTTP spec
and to make it clear which direction the dependency points.

Change-Id: I715b9f87a8ca614efd7d816c9f4229c52747e142
Reviewed-on: https://chromium-review.googlesource.com/917203
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Randy Smith <rdsmith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537538}