Modified PolicyService to register observers by domain only, instead of domain and component.

chrome/browser/policy/policy_service.h

 // Copyright (c) 2012 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_POLICY_SERVICE_H_
 #define CHROME_BROWSER_POLICY_POLICY_SERVICE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 39 matching lines @@
     // IsInitializationComplete() is false, then this will be invoked once all
     // the policy providers are ready.
     virtual void OnPolicyServiceInitialized() {}
 
    protected:
     virtual ~Observer() {}
   };
 
   virtual ~PolicyService() {}
 
-  virtual void AddObserver(PolicyDomain domain,
-                           const std::string& component_id,
-                           Observer* observer) = 0;
+  // Observes changes to all components of the given |domain|.
+  virtual void AddObserver(PolicyDomain domain, Observer* observer) = 0;
 
-  virtual void RemoveObserver(PolicyDomain domain,
-                              const std::string& component_id,
-                              Observer* observer) = 0;
+  virtual void RemoveObserver(PolicyDomain domain, Observer* observer) = 0;
 
   virtual const PolicyMap& GetPolicies(
       PolicyDomain domain,
       const std::string& component_id) const = 0;
 
   // The PolicyService loads policy from several sources, and some require
   // asynchronous loads. IsInitializationComplete() returns true once all
   // sources have loaded their policies. It is safe to read policy from the
   // PolicyService even if IsInitializationComplete() is false; there will be an
   // OnPolicyUpdated() notification once new policies become available.
@@ skipping 45 matching lines @@
   PolicyDomain domain_;
   std::string component_id_;
   CallbackMap callback_map_;
 
   DISALLOW_COPY_AND_ASSIGN(PolicyChangeRegistrar);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_POLICY_SERVICE_H_