Add operator<<(ostream, AlternativeService) for test output formatting.

net/http/http_server_properties_impl_unittest.cc

Index: net/http/http_server_properties_impl_unittest.cc
diff --git a/net/http/http_server_properties_impl_unittest.cc b/net/http/http_server_properties_impl_unittest.cc
index d6283c4f55d12ab75e8ce51ca640cdbb200f3338..57a15bcc37970f2b3559ae4481d828ab81f23e4a 100644
--- a/net/http/http_server_properties_impl_unittest.cc
+++ b/net/http/http_server_properties_impl_unittest.cc
@@ -44,10 +44,6 @@ class HttpServerPropertiesImplPeer {
   }
 };
 
-void PrintTo(const AlternativeService& alternative_service, std::ostream* os) {
-  *os << alternative_service.ToString();
-}
-
 namespace {
 
 const int kMaxSupportsSpdyServerHosts = 500;