Index: modules/user/user.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.admin.inc,v
retrieving revision 1.58
diff -u -p -r1.58 user.admin.inc
--- modules/user/user.admin.inc	15 Jun 2009 09:49:58 -0000	1.58
+++ modules/user/user.admin.inc	27 Jun 2009 10:57:45 -0000
@@ -945,3 +945,24 @@ function user_modules_installed($modules
     }
   }
 }
+
+/**
+ * Implementation of hook_modules_uninstalled().
+ */
+function user_modules_uninstalled($modules) {
+  // Remove all permissions from the administrator role.
+  $rid = variable_get('user_admin_role', 0);
+  if ($rid) {
+    foreach ($modules as $module) {
+      if ($permissions = module_invoke($module, 'perm')) {
+        foreach (array_keys($permissions) as $permission) {
+          db_delete('role_permission')
+            ->condition('rid', $rid)
+            ->condition('permission', $permission)
+            ->execute();
+        }
+      }
+    }
+  }
+}
+