Implement nextHopProtocol in PerformanceResourceTiming and PerformanceNavigationTiming.

content/public/renderer/document_state.h

Index: content/public/renderer/document_state.h
diff --git a/content/public/renderer/document_state.h b/content/public/renderer/document_state.h
index 655cd917f2c83e91ebd22f1edd837626785e391d..c1c8f68b0aba52ba8e4ff705a84166975dc5f900 100644
--- a/content/public/renderer/document_state.h
+++ b/content/public/renderer/document_state.h
@@ -54,11 +54,8 @@ class CONTENT_EXPORT DocumentState
     was_alternate_protocol_available_ = value;
   }
 
-  net::HttpResponseInfo::ConnectionInfo connection_info() const {
-    return connection_info_;
-  }
-  void set_connection_info(
-      net::HttpResponseInfo::ConnectionInfo connection_info) {
+  std::string connection_info() const { return connection_info_; }
+  void set_connection_info(const std::string& connection_info) {
     connection_info_ = connection_info;
   }
 
@@ -92,7 +89,7 @@ class CONTENT_EXPORT DocumentState
   bool was_alpn_negotiated_;
   std::string alpn_negotiated_protocol_;
   bool was_alternate_protocol_available_;
-  net::HttpResponseInfo::ConnectionInfo connection_info_;
+  std::string connection_info_;
 
   bool was_load_data_with_base_url_request_;
   GURL data_url_;