Use the display name on ChromeOS instead of the profile name.

chrome/browser/supervised_user/supervised_user_service.h

Index: chrome/browser/supervised_user/supervised_user_service.h
diff --git a/chrome/browser/supervised_user/supervised_user_service.h b/chrome/browser/supervised_user/supervised_user_service.h
index a92e34d257f1748e58cd50a390d91a3f71b9fed8..5f2d4e683977f2d7392b26f1342ee16c834421b3 100644
--- a/chrome/browser/supervised_user/supervised_user_service.h
+++ b/chrome/browser/supervised_user/supervised_user_service.h
@@ -264,6 +264,9 @@ class SupervisedUserService : public KeyedService,
   // corresponding preference is changed.
   void UpdateManualURLs();
 
+  // Returns the human readable name of the supervised user.
+  std::string GetSupervisedUserName() const;
+
   // Owns us via the KeyedService mechanism.
   Profile* profile_;