Revert of Pref service: add support for tracked prefs.

services/preferences/tracked/segregated_pref_store_unittest.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 <memory>
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 55 matching lines @@
 
   void SetUp() override {
     selected_store_ = new TestingPrefStore;
     default_store_ = new TestingPrefStore;
 
     std::set<std::string> selected_pref_names;
     selected_pref_names.insert(kSelectedPref);
     selected_pref_names.insert(kSharedPref);
 
     segregated_store_ = new SegregatedPrefStore(default_store_, selected_store_,
-                                                selected_pref_names, nullptr);
+                                                selected_pref_names);
 
     segregated_store_->AddObserver(&observer_);
   }
 
   void TearDown() override { segregated_store_->RemoveObserver(&observer_); }
 
  protected:
   std::unique_ptr<PersistentPrefStore::ReadErrorDelegate>
   GetReadErrorDelegate() {
     EXPECT_TRUE(read_error_delegate_);
@@ skipping 208 matching lines @@
   EXPECT_TRUE(base::Value(kValue1).Equals(value));
 
   // Check that a a default preference is returned.
   ASSERT_TRUE(values->Get(kUnselectedPref, &value));
   EXPECT_TRUE(base::Value(kValue2).Equals(value));
 
   // Check that the selected preference is preferred.
   ASSERT_TRUE(values->Get(kSharedPref, &value));
   EXPECT_TRUE(base::Value(kValue1).Equals(value));
 }