[Sync] Update SyncBackendHost to forward ClearServerData to SyncManager

chrome/browser/sync/glue/sync_backend_host_impl.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 "chrome/browser/sync/glue/sync_backend_host_impl.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 854 matching lines @@
 }
 
 void SyncBackendHostImpl::RefreshTypesForTest(syncer::ModelTypeSet types) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   registrar_->sync_thread()->task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&SyncBackendHostCore::DoRefreshTypes, core_.get(), types));
 }
 
+void SyncBackendHostImpl::ClearServerData(
+    const syncer::SyncManager::ClearServerDataCallback& callback) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  registrar_->sync_thread()->task_runner()->PostTask(
+      FROM_HERE, base::Bind(&SyncBackendHostCore::DoClearServerData,
+                            core_.get(), callback));
+}
+
+void SyncBackendHostImpl::ClearServerDataDoneOnFrontendLoop(
+    const syncer::SyncManager::ClearServerDataCallback& frontend_callback) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  frontend_callback.Run();
+}
+
 }  // namespace browser_sync
 
 #undef SDVLOG
 
 #undef SLOG