fix a google string vs std::string issue for easier import (#5685)
fix a google string vs std::string issue for easier import (#5685)

Signed-off-by: Xin Zhuang <330dc088b8ee8b9d7082d5670a43cab2eecd1492@google.com>

dnoe/envoy,istio/envoy,istio/envoy,istio/envoy,jrajahalme/envoy,lyft/envoy,lyft/envoy,istio/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy,eklitzke/envoy,eklitzke/envoy,envoyproxy/envoy,dnoe/envoy,jrajahalme/envoy,istio/envoy,lizan/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lizan/envoy,lyft/envoy,jrajahalme/envoy,lizan/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,dnoe/envoy,jrajahalme/envoy,lyft/envoy,lizan/envoy,lizan/envoy,lyft/envoy,dnoe/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,dnoe/envoy,envoyproxy/envoy,istio/envoy,envoyproxy/envoy