Only show prefer network checkbox for networks stored on user profile.

chrome/browser/chromeos/cros/network_library.h

Index: chrome/browser/chromeos/cros/network_library.h
===================================================================
--- chrome/browser/chromeos/cros/network_library.h	(revision 95328)
+++ chrome/browser/chromeos/cros/network_library.h	(working copy)
@@ -1294,6 +1294,11 @@
   // If nothing is changed, this method does nothing.
   virtual void SetIPConfig(const NetworkIPConfig& ipconfig) = 0;
 
+  // This will connect to a preferred network if the currently connected
+  // network is not preferred. This should be called when the active profile
+  // changes.
+  virtual void SwitchToPreferredNetwork() = 0;
+
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via CrosLibrary::Get().
   static NetworkLibrary* GetImpl(bool stub);