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Now that the flags protecting jamessynge@'s HTTP2FrameDecoder have been
deprecated, we can begin cleaning up the old code.

Next step is probably to try to start sorting out the adapters.

This CL lands server change 162220378 by dahollings.

BUG=488484

Change-Id: I875f5a6448dc9c0bc765f62a5b6424510dc6ff6a
Reviewed-on: https://chromium-review.googlesource.com/581389Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Dianna Hu <diannahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488712}