http1: remove unimplemented constructor (#7905)
http1: remove unimplemented constructor (#7905)

Removes a stale, unimplemented constructor definition.

Risk Level: low
Testing: n/a
Doc Changes: n/a
Release Notes: n/a

Signed-off-by: Stephan Zuercher <12de3568c51b3e8be16eecacef359e62ce51b8cc@gmail.com>
istio/envoy,jrajahalme/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy,istio/envoy,lyft/envoy,istio/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy,istio/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,envoyproxy/envoy-wasm,istio/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lizan/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,eklitzke/envoy,istio/envoy,lizan/envoy,lyft/envoy,envoyproxy/envoy,istio/envoy,eklitzke/envoy,envoyproxy/envoy,eklitzke/envoy,lizan/envoy,lyft/envoy,lyft/envoy,lyft/envoy,lizan/envoy,envoyproxy/envoy