Revert of Delete base/prefs and update callers to use components.

ios/crnet/sdch_owner_pref_storage.cc

 // Copyright 2015 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 "ios/crnet/sdch_owner_pref_storage.h"
 
+#include "base/prefs/persistent_pref_store.h"
 #include "base/values.h"
-#include "components/prefs/persistent_pref_store.h"
 
 namespace {
 
 static const char kStorageKey[] = "SDCH";
 
 }  // namespace
 
 SdchOwnerPrefStorage::SdchOwnerPrefStorage(PersistentPrefStore* storage)
     : storage_(storage),
       storage_key_(kStorageKey),
@@ skipping 79 matching lines @@
   storage_->RemoveObserver(this);
 }
 
 void SdchOwnerPrefStorage::OnPrefValueChanged(const std::string& key) {
 }
 
 void SdchOwnerPrefStorage::OnInitializationCompleted(bool succeeded) {
   DCHECK(init_observer_);
   init_observer_->OnPrefStorageInitializationComplete(succeeded);
 }