Move signin status and current user information into AppListModel.

ui/app_list/cocoa/app_list_view_controller.h

Index: ui/app_list/cocoa/app_list_view_controller.h
diff --git a/ui/app_list/cocoa/app_list_view_controller.h b/ui/app_list/cocoa/app_list_view_controller.h
index 2815e0a223aaf5ece1beb30138507e4c3ee3f36e..b993a67683b7ac0f20c540c02f9905233edf1627 100644
--- a/ui/app_list/cocoa/app_list_view_controller.h
+++ b/ui/app_list/cocoa/app_list_view_controller.h
@@ -17,7 +17,7 @@
 namespace app_list {
 class AppListViewDelegate;
 class AppListModel;
-class SigninDelegateObserverBridge;
+class AppListModelObserverBridge;
 }
 
 @class AppListPagerView;
@@ -46,7 +46,8 @@ APP_LIST_EXPORT
   base::scoped_nsobject<NSView> contentsView_;
 
   scoped_ptr<app_list::AppListViewDelegate> delegate_;
-  scoped_ptr<app_list::SigninDelegateObserverBridge> signin_observer_bridge_;
+  scoped_ptr<app_list::AppListModelObserverBridge>
+      app_list_model_observer_bridge_;
   BOOL showingSearchResults_;
 }