Revert of Fold UpdateModel into UpdateScreen.

chrome/browser/chromeos/login/screens/update_view.h

Index: chrome/browser/chromeos/login/screens/update_view.h
diff --git a/chrome/browser/chromeos/login/screens/update_view.h b/chrome/browser/chromeos/login/screens/update_view.h
index 17de164fb55b1f9daecf323a44cfbe325afabe0b..58c33916c8a723f114899788cfc54b85eef20e7b 100644
--- a/chrome/browser/chromeos/login/screens/update_view.h
+++ b/chrome/browser/chromeos/login/screens/update_view.h
@@ -9,7 +9,7 @@
 
 namespace chromeos {
 
-class UpdateScreen;
+class UpdateModel;
 
 // Interface for dependency injection between NetworkScreen and its actual
 // representation. Owned by UpdateScreen.
@@ -23,10 +23,10 @@
   // Hides the contents of the screen.
   virtual void Hide() = 0;
 
-  // Binds |screen| to the view.
-  virtual void Bind(UpdateScreen* screen) = 0;
+  // Binds |model| to the view.
+  virtual void Bind(UpdateModel& model) = 0;
 
-  // Unbinds the screen from the view.
+  // Unbinds model from the view.
   virtual void Unbind() = 0;
 };