[CrOS Tether] Transform NetworkConnectionHandler to an interface.

chromeos/network/network_handler.cc

Index: chromeos/network/network_handler.cc
diff --git a/chromeos/network/network_handler.cc b/chromeos/network/network_handler.cc
index 2039b92d28ae939b03b454aad5e355630b367c5b..20c72b942863a392444e43a2795396e26f9cce4a 100644
--- a/chromeos/network/network_handler.cc
+++ b/chromeos/network/network_handler.cc
@@ -14,7 +14,7 @@
 #include "chromeos/network/network_activation_handler.h"
 #include "chromeos/network/network_cert_migrator.h"
 #include "chromeos/network/network_configuration_handler.h"
-#include "chromeos/network/network_connection_handler.h"
+#include "chromeos/network/network_connection_handler_impl.h"
 #include "chromeos/network/network_device_handler_impl.h"
 #include "chromeos/network/network_profile_handler.h"
 #include "chromeos/network/network_profile_observer.h"
@@ -45,7 +45,7 @@ NetworkHandler::NetworkHandler()
     client_cert_resolver_.reset(new ClientCertResolver());
   }
   network_activation_handler_.reset(new NetworkActivationHandler());
-  network_connection_handler_.reset(new NetworkConnectionHandler());
+  network_connection_handler_.reset(new NetworkConnectionHandlerImpl());
   network_sms_handler_.reset(new NetworkSmsHandler());
   geolocation_handler_.reset(new GeolocationHandler());
 }