Use mojo for Chrome Loading, Part 1

net/http/http_response_headers.h

Index: net/http/http_response_headers.h
diff --git a/net/http/http_response_headers.h b/net/http/http_response_headers.h
index 653eacc4d44e30b86d15c41532ec2514ef8ba435..0527073358274eec08c9d7b69222a4f1cf939a13 100644
--- a/net/http/http_response_headers.h
+++ b/net/http/http_response_headers.h
@@ -79,6 +79,8 @@ class NET_EXPORT HttpResponseHeaders
   // Appends a representation of this object to the given pickle.
   // The options argument can be a combination of PersistOptions.
   void Persist(base::Pickle* pickle, PersistOptions options);
+  // Does the same as Persist, but puts the output string to |*output|.
+  void PersistTo(PersistOptions options, std::string* output);
 
   // Performs header merging as described in 13.5.3 of RFC 2616.
   void Update(const HttpResponseHeaders& new_headers);