Revert of [Sync] Make directory types registration explicit in ModelTypeRegistry

components/sync/engine/fake_sync_engine.cc

 // Copyright 2013 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/sync/engine/fake_sync_engine.h"
 
 #include "components/sync/engine/activation_context.h"
 #include "components/sync/engine/sync_engine_host.h"
 
 namespace syncer {
 
 const char kTestCacheGuid[] = "test-guid";
 
 FakeSyncEngine::FakeSyncEngine() : fail_initial_download_(false) {}
 FakeSyncEngine::~FakeSyncEngine() {}
 
 void FakeSyncEngine::Initialize(InitParams params) {
   params.host->OnEngineInitialized(ModelTypeSet(), WeakHandle<JsBackend>(),
                                    WeakHandle<DataTypeDebugInfoListener>(),
                                    kTestCacheGuid, !fail_initial_download_);
 }
 
 void FakeSyncEngine::TriggerRefresh(const ModelTypeSet& types) {}
 
 void FakeSyncEngine::UpdateCredentials(const SyncCredentials& credentials) {}
 
-void FakeSyncEngine::StartConfiguration() {}
-
 void FakeSyncEngine::StartSyncingWithServer() {}
 
 void FakeSyncEngine::SetEncryptionPassphrase(const std::string& passphrase,
                                              bool is_explicit) {}
 
 bool FakeSyncEngine::SetDecryptionPassphrase(const std::string& passphrase) {
   return false;
 }
 
 void FakeSyncEngine::StopSyncingForShutdown() {}
 
 void FakeSyncEngine::Shutdown(ShutdownReason reason) {}
 
 void FakeSyncEngine::ConfigureDataTypes(ConfigureParams params) {}
 
-void FakeSyncEngine::RegisterDirectoryDataType(ModelType type,
-                                               ModelSafeGroup group) {}
-
-void FakeSyncEngine::UnregisterDirectoryDataType(ModelType type) {}
-
 void FakeSyncEngine::EnableEncryptEverything() {}
 
 void FakeSyncEngine::ActivateDirectoryDataType(
     ModelType type,
     ModelSafeGroup group,
     ChangeProcessor* change_processor) {}
 void FakeSyncEngine::DeactivateDirectoryDataType(ModelType type) {}
 
 void FakeSyncEngine::ActivateNonBlockingDataType(
     ModelType type,
@@ skipping 49 matching lines @@
 
 void FakeSyncEngine::ClearServerData(
     const SyncManager::ClearServerDataCallback& callback) {
   callback.Run();
 }
 
 void FakeSyncEngine::OnCookieJarChanged(bool account_mismatch, bool empty_jar) {
 }
 
 }  // namespace syncer