Elim parent_window parameter from network_connect

ash/system/tray/system_tray_delegate.h

Index: ash/system/tray/system_tray_delegate.h
diff --git a/ash/system/tray/system_tray_delegate.h b/ash/system/tray/system_tray_delegate.h
index f235fb2e3d3f911ddf5efa9f4b0a26fba7109f95..72c276e68c3b565d87b3e4f71a9f13b6634938df 100644
--- a/ash/system/tray/system_tray_delegate.h
+++ b/ash/system/tray/system_tray_delegate.h
@@ -235,16 +235,11 @@ class ASH_EXPORT SystemTrayDelegate {
 
   // Shows UI to configure or activate the network specified by |network_id|,
   // which may include showing Payment or Portal UI when appropriate.
-  // |parent_window| is used to parent any configuration UI. If NULL a default
-  // window will be used.
-  virtual void ShowNetworkConfigure(const std::string& network_id,
-                                    gfx::NativeWindow parent_window) = 0;
+  virtual void ShowNetworkConfigure(const std::string& network_id) = 0;
 
   // Shows UI to enroll the network specified by |network_id| if appropriate
-  // and returns true, otherwise returns false. |parent_window| is used
-  // to parent any configuration UI. If NULL a default window will be used.
-  virtual bool EnrollNetwork(const std::string& network_id,
-                             gfx::NativeWindow parent_window) = 0;
+  // and returns true, otherwise returns false.
+  virtual bool EnrollNetwork(const std::string& network_id) = 0;
 
   // Shows UI to manage bluetooth devices.
   virtual void ManageBluetoothDevices() = 0;