Revert "Reland c91b178b07b0d - Delete dead signin code (SigninGlobalError)"

chrome/browser/ui/browser_command_controller.h

Index: chrome/browser/ui/browser_command_controller.h
diff --git a/chrome/browser/ui/browser_command_controller.h b/chrome/browser/ui/browser_command_controller.h
index 0e564c0b9acf95e4ad760c10e4997a4e030dcb02..05ec35a47e0daaa4934b7ac40648216e08c41a03 100644
--- a/chrome/browser/ui/browser_command_controller.h
+++ b/chrome/browser/ui/browser_command_controller.h
@@ -140,9 +140,15 @@ class BrowserCommandController : public CommandUpdaterDelegate,
   // Updates the printing command state.
   void UpdatePrintingState();
 
+  // Updates the SHOW_SYNC_SETUP menu entry.
+  void OnSigninAllowedPrefChange();
+
   // Updates the save-page-as command state.
   void UpdateSaveAsState();
 
+  // Updates the show-sync command state.
+  void UpdateShowSyncState(bool show_main_ui);
+
   // Ask the Reload/Stop button to change its icon, and update the Stop command
   // state.  |is_loading| is true if the current WebContents is loading.
   // |force| is true if the button should change its icon immediately.
@@ -179,6 +185,7 @@ class BrowserCommandController : public CommandUpdaterDelegate,
 
   PrefChangeRegistrar profile_pref_registrar_;
   PrefChangeRegistrar local_pref_registrar_;
+  BooleanPrefMember pref_signin_allowed_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCommandController);
 };