Implement multiple alternative services per origin.

net/http/http_server_properties_impl.h

Index: net/http/http_server_properties_impl.h
diff --git a/net/http/http_server_properties_impl.h b/net/http/http_server_properties_impl.h
index 3ea0875c2009a717b3659297782d4cac113a7541..8c0546d6abe6aacc26decb2cd4deeba512cbfa39 100644
--- a/net/http/http_server_properties_impl.h
+++ b/net/http/http_server_properties_impl.h
@@ -87,8 +87,9 @@ class NET_EXPORT HttpServerPropertiesImpl
   void SetHTTP11Required(const HostPortPair& server) override;
   void MaybeForceHTTP11(const HostPortPair& server,
                         SSLConfig* ssl_config) override;
-  AlternativeService GetAlternativeService(const HostPortPair& origin) override;
-  void SetAlternativeService(const HostPortPair& origin,
+  AlternativeServiceVector GetAlternativeServices(
+      const HostPortPair& origin) override;
+  void AddAlternativeService(const HostPortPair& origin,
                              const AlternativeService& alternative_service,
                              double alternative_probability) override;
   void MarkAlternativeServiceBroken(
@@ -101,7 +102,7 @@ class NET_EXPORT HttpServerPropertiesImpl
       const AlternativeService& alternative_service) override;
   void ConfirmAlternativeService(
       const AlternativeService& alternative_service) override;
-  void ClearAlternativeService(const HostPortPair& origin) override;
+  void ClearAlternativeServices(const HostPortPair& origin) override;
   const AlternativeServiceMap& alternative_service_map() const override;
   scoped_ptr<base::Value> GetAlternativeServiceInfoAsValue() const override;
   void SetAlternativeServiceProbabilityThreshold(double threshold) override;