Range based for loops in HPACK encoder. No behavior change.
Range based for loops in HPACK encoder. No behavior change.

This CL lands server change 98758957 by rjshade.

BUG=488484

Review URL: https://codereview.chromium.org/1260063002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#340886}

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