Revert of Pref service: add support for tracked prefs.

services/preferences/tracked/segregated_pref_store.cc

 // Copyright 2014 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.
 
 #include "services/preferences/tracked/segregated_pref_store.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 33 matching lines @@
     }
 
     for (auto& observer : outer_->observers_)
       observer.OnInitializationCompleted(successful_sub_initializations_ == 2);
   }
 }
 
 SegregatedPrefStore::SegregatedPrefStore(
     const scoped_refptr<PersistentPrefStore>& default_pref_store,
     const scoped_refptr<PersistentPrefStore>& selected_pref_store,
-    const std::set<std::string>& selected_pref_names,
-    prefs::mojom::TrackedPreferenceValidationDelegatePtr validation_delegate)
-    : validation_delegate_(std::move(validation_delegate)),
-      default_pref_store_(default_pref_store),
+    const std::set<std::string>& selected_pref_names)
+    : default_pref_store_(default_pref_store),
       selected_pref_store_(selected_pref_store),
       selected_preference_names_(selected_pref_names),
       aggregating_observer_(this) {
   default_pref_store_->AddObserver(&aggregating_observer_);
   selected_pref_store_->AddObserver(&aggregating_observer_);
 }
 
 void SegregatedPrefStore::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
@@ skipping 118 matching lines @@
       .get();
 }
 
 const PersistentPrefStore* SegregatedPrefStore::StoreForKey(
     const std::string& key) const {
   return (base::ContainsKey(selected_preference_names_, key)
               ? selected_pref_store_
               : default_pref_store_)
       .get();
 }