Revert of Add PrefStore::GetValues

components/prefs/value_map_pref_store.cc

 // 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.
 
 #include "components/prefs/value_map_pref_store.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/stl_util.h"
 #include "base/values.h"
 
 ValueMapPrefStore::ValueMapPrefStore() {}
 
 bool ValueMapPrefStore::GetValue(const std::string& key,
                                  const base::Value** value) const {
   return prefs_.GetValue(key, value);
 }
 
-std::unique_ptr<base::DictionaryValue> ValueMapPrefStore::GetValues() const {
-  return prefs_.AsDictionaryValue();
-}
-
 void ValueMapPrefStore::AddObserver(PrefStore::Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void ValueMapPrefStore::RemoveObserver(PrefStore::Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 bool ValueMapPrefStore::HasObservers() const {
   return observers_.might_have_observers();
@@ skipping 31 matching lines @@
                                          uint32_t flags) {
   prefs_.SetValue(key, std::move(value));
 }
 
 ValueMapPrefStore::~ValueMapPrefStore() {}
 
 void ValueMapPrefStore::NotifyInitializationCompleted() {
   for (Observer& observer : observers_)
     observer.OnInitializationCompleted(true);
 }