http: declare the upstream codec filter (#23172)
http: declare the upstream codec filter (#23172)

Risk Level: low
Testing: n/a
Docs Changes: n/a
Release Notes: n/a
envoyproxy/envoy-mobile#1622

Signed-off-by: Alyssa Wilk <b9253d1ec9cc3e9d2aab68d288ba3dab3452adf6@chromium.org>
envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy