Policy providers all get a SchemaRegistry to work with.

chrome/browser/policy/schema_registry.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_POLICY_SCHEMA_REGISTRY_H_
 #define CHROME_BROWSER_POLICY_SCHEMA_REGISTRY_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 11 matching lines @@
 
 // Holds the main reference to the current SchemaMap, and allows a list of
 // observers to get notified whenever it is updated.
 // This object is not thread safe and must be used from the owner's thread,
 // usually UI.
 class SchemaRegistry : public base::NonThreadSafe {
  public:
   class Observer {
    public:
     // Invoked whenever schemas are registered or unregistered.
-    // |current_map| is a reference to the current map, also returned by
-    // schema_map();
     // |has_new_schemas| is true if a new component has been registered since
     // the last update; this allows observers to ignore updates when
     // components are unregistered but still get a handle to the current map
     // (e.g. for periodic reloads).
-    virtual void OnSchemaRegistryUpdated(
-        const scoped_refptr<SchemaMap>& current_map,
-        bool has_new_schemas) = 0;
+    virtual void OnSchemaRegistryUpdated(bool has_new_schemas) = 0;
 
    protected:
     virtual ~Observer();
   };
 
   SchemaRegistry();
   virtual ~SchemaRegistry();
 
   const scoped_refptr<SchemaMap>& schema_map() const { return schema_map_; }
 
@@ skipping 31 matching lines @@
   virtual ~CombinedSchemaRegistry();
 
   void Track(SchemaRegistry* registry);
   void Untrack(SchemaRegistry* registry);
 
   virtual void RegisterComponents(PolicyDomain domain,
                                   const ComponentMap& components) OVERRIDE;
 
   virtual void UnregisterComponent(const PolicyNamespace& ns) OVERRIDE;
 
-  virtual void OnSchemaRegistryUpdated(
-      const scoped_refptr<SchemaMap>& current_map,
-      bool has_new_schemas) OVERRIDE;
+  virtual void OnSchemaRegistryUpdated(bool has_new_schemas) OVERRIDE;
 
  private:
   void Combine(bool has_new_schemas);
 
   std::set<SchemaRegistry*> registries_;
   scoped_refptr<SchemaMap> own_schema_map_;
 
   DISALLOW_COPY_AND_ASSIGN(CombinedSchemaRegistry);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_SCHEMA_REGISTRY_H_