[CrOS Tether] Transform NetworkConnectionHandler to an interface.

chromeos/network/network_connection_handler_unittest.cc

Index: chromeos/network/network_connection_handler_unittest.cc
diff --git a/chromeos/network/network_connection_handler_unittest.cc b/chromeos/network/network_connection_handler_unittest.cc
index 81bbd421c1c56c188b70ac159f9d9a7a9bda3f5b..2ad198f30eef9a5754d312d787821d73d84f0cf8 100644
--- a/chromeos/network/network_connection_handler_unittest.cc
+++ b/chromeos/network/network_connection_handler_unittest.cc
@@ -152,7 +152,7 @@ class NetworkConnectionHandlerTest : public NetworkStateTest {
         network_config_handler_.get(), nullptr /* network_device_handler */,
         nullptr /* prohibited_tecnologies_handler */);
 
-    network_connection_handler_.reset(new NetworkConnectionHandler);
+    network_connection_handler_ = NetworkConnectionHandler::Create();

[stevenjb, 2017/05/03 22:05:38]

new NetworkConnectionHandlerImpl(), just like we do for
ManagedNetworkConfigurationHandlerImpl above.

[Kyle Horimoto, 2017/05/03 22:38:30]

Done.

     network_connection_handler_->Init(network_state_handler(),
                                       network_config_handler_.get(),
                                       managed_config_handler_.get());