Implement utility-side host resolver Mojo client.

net/dns/mojo_type_converters.h

Index: net/dns/mojo_type_converters.h
diff --git a/net/dns/mojo_type_converters.h b/net/dns/mojo_type_converters.h
index 0c99b8c59b10e5671045c0366273066c2e2114c9..4e17a69c21b24757aa71ac7e49f6b91e61f20201 100644
--- a/net/dns/mojo_type_converters.h
+++ b/net/dns/mojo_type_converters.h
@@ -18,6 +18,13 @@ struct TypeConverter<net::HostResolver::RequestInfo,
 };
 
 template <>
+struct TypeConverter<net::interfaces::HostResolverRequestInfoPtr,
+                     net::HostResolver::RequestInfo> {
+  static net::interfaces::HostResolverRequestInfoPtr Convert(
+      const net::HostResolver::RequestInfo& obj);
+};
+
+template <>
 struct TypeConverter<net::interfaces::AddressListPtr, net::AddressList> {
   static net::interfaces::AddressListPtr Convert(const net::AddressList& obj);
 };