ProtectorService supports multiple change instances.

chrome/browser/protector/settings_change_global_error.h

Index: chrome/browser/protector/settings_change_global_error.h
diff --git a/chrome/browser/protector/settings_change_global_error.h b/chrome/browser/protector/settings_change_global_error.h
index d7db869af3bbafd6c1a05d8955eb13947ad0c705..7a1b462a55b53e63f633248b8494f81d057708c2 100644
--- a/chrome/browser/protector/settings_change_global_error.h
+++ b/chrome/browser/protector/settings_change_global_error.h
@@ -6,10 +6,13 @@
 #define CHROME_BROWSER_PROTECTOR_SETTINGS_CHANGE_GLOBAL_ERROR_H_
 #pragma once
 
+#include <bitset>
+
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/protector/base_setting_change.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/global_error.h"
@@ -40,6 +43,9 @@ class SettingsChangeGlobalError : public GlobalError,
   // Removes global error from its profile.
   void RemoveFromProfile();
 
+  // Returns the change instance to which this error refers.
+  BaseSettingChange* change() { return change_; }
+
  private:
   // GlobalError implementation.
   virtual bool HasBadge() OVERRIDE;
@@ -97,6 +103,13 @@ class SettingsChangeGlobalError : public GlobalError,
 
   base::WeakPtrFactory<SettingsChangeGlobalError> weak_factory_;
 
+  // Menu command ID assigned to |this| from the pool of available IDs.
+  int menu_id_;
+
+  // Unset bits indicate available command IDs.
+  static std::bitset<IDC_SHOW_SETTINGS_CHANGE_LAST -

[whywhat, 2012/02/29 18:55:14]

Using statis non-elementary types members is also forbidden. Could be a pointer
to bitset though.
Will static bitset work with multiple-profiles?

[Ivan Korotkov, 2012/02/29 19:23:44]

As discussed, it's used application-wide for vectors/maps.

+                     IDC_SHOW_SETTINGS_CHANGE_FIRST + 1> menu_ids_;
+
   DISALLOW_COPY_AND_ASSIGN(SettingsChangeGlobalError);
 };