[Sync] Update SyncBackendHost to forward ClearServerData to SyncManager

sync/test/engine/fake_sync_scheduler.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 "sync/test/engine/fake_sync_scheduler.h"
 
 namespace syncer {
 
 FakeSyncScheduler::FakeSyncScheduler() {}
 
@@ skipping 20 matching lines @@
     scoped_ptr<InvalidationInterface> interface,
     const tracked_objects::Location& nudge_location) {
 }
 
 void FakeSyncScheduler::ScheduleConfiguration(
      const ConfigurationParams& params) {
   params.ready_task.Run();
 }
 
 void FakeSyncScheduler::ScheduleClearServerData(const ClearParams& params) {
-  NOTIMPLEMENTED();
+  params.report_success_task.Run();
 }
 
 void FakeSyncScheduler::ScheduleInitialSyncNudge(syncer::ModelType model_type) {
 }
 
 void FakeSyncScheduler::SetNotificationsEnabled(bool notifications_enabled) {
 }
 
 void FakeSyncScheduler::OnCredentialsUpdated() {
 
@@ skipping 35 matching lines @@
 }
 
 void FakeSyncScheduler::OnReceivedGuRetryDelay(
     const base::TimeDelta& delay) {
 }
 
 void FakeSyncScheduler::OnReceivedMigrationRequest(ModelTypeSet types) {
 }
 
 }  // namespace syncer