Pref service: add support for tracked prefs.

chrome/browser/profiles/profile_impl.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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 
 #include <memory>
@@ skipping 32 matching lines @@
 namespace domain_reliability {
 class DomainReliabilityMonitor;
 }
 
 namespace policy {
 class ConfigurationPolicyProvider;
 class ProfilePolicyConnector;
 class SchemaRegistryService;
 }
 
-namespace prefs {
-namespace mojom {
-class TrackedPreferenceValidationDelegate;
-}
-}
-
 namespace ssl_config {
 class SSLConfigServiceManager;
 }
 
 namespace sync_preferences {
 class PrefServiceSyncable;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
@@ skipping 146 matching lines @@
   // PolicyService that the |prefs_| depend on, and must outlive |prefs_|. This
   // can be removed once |prefs_| becomes a KeyedService too.
   // |profile_policy_connector_| in turn depends on
   // |configuration_policy_provider_|, which depends on
   // |schema_registry_service_|.
   std::unique_ptr<policy::SchemaRegistryService> schema_registry_service_;
   std::unique_ptr<policy::ConfigurationPolicyProvider>
       configuration_policy_provider_;
   std::unique_ptr<policy::ProfilePolicyConnector> profile_policy_connector_;
 
-  // Keep |pref_validation_delegate_| above |prefs_| so that the former outlives
-  // the latter.
-  std::unique_ptr<prefs::mojom::TrackedPreferenceValidationDelegate>
-      pref_validation_delegate_;
-
   // Keep |prefs_| on top for destruction order because |extension_prefs_|,
   // |io_data_| and others store pointers to |prefs_| and shall be destructed
   // first.
   scoped_refptr<user_prefs::PrefRegistrySyncable> pref_registry_;
   std::unique_ptr<sync_preferences::PrefServiceSyncable> prefs_;
   std::unique_ptr<sync_preferences::PrefServiceSyncable> otr_prefs_;
   ProfileImplIOData::Handle io_data_;
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   scoped_refptr<ExtensionSpecialStoragePolicy>
       extension_special_storage_policy_;
@@ skipping 37 matching lines @@
   // components/keyed_service/content/browser_context_keyed_service_factory.*
 
   Profile::Delegate* delegate_;
 
   chrome_browser_net::Predictor* predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_