SanitizeProxyAuth: Whitelist all hop-by-hop headers

We were discarding "Proxy-Authenticate: keep-alive" headers in HTTP/1.0 responses, which broke multi-step connection-level authentication methods for proxies that sent HTTP/1.0 responses.

BUG=463937

Review URL: https://codereview.chromium.org/982733002

Cr-Commit-Position: refs/heads/master@{#319219}
2 files changed