Elim parent_window parameter from network_connect

ash/system/chromeos/network/network_connect.h

Index: ash/system/chromeos/network/network_connect.h
diff --git a/ash/system/chromeos/network/network_connect.h b/ash/system/chromeos/network/network_connect.h
index 2d72938759bb122f9c2db03ec4662f052e37ad78..effef6c21b72c817e0fc1e8992f0567b140bbff1 100644
--- a/ash/system/chromeos/network/network_connect.h
+++ b/ash/system/chromeos/network/network_connect.h
@@ -28,10 +28,7 @@ ASH_EXPORT extern const char kNetworkActivateNotificationId[];
 ASH_EXPORT extern const char kErrorActivateFailed[];
 
 // Requests a network connection and handles any errors and notifications.
-// |parent_window| is used to parent any UI on failure (e.g. for certificate
-// enrollment). If NULL, the default window will be used.
-ASH_EXPORT void ConnectToNetwork(const std::string& service_path,
-                                 gfx::NativeWindow parent_window);
+ASH_EXPORT void ConnectToNetwork(const std::string& service_path);
 
 // Enables or disables a network technology. If |technology| refers to cellular
 // and the device cannot be enabled due to a SIM lock, this function will