[Sync] Update SyncBackendHost to forward ClearServerData to SyncManager

chrome/browser/sync/glue/sync_backend_host_core.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_core.h"
 
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 725 matching lines @@
   save_changes_timer_->Start(FROM_HERE,
       base::TimeDelta::FromSeconds(kSaveChangesIntervalSeconds),
       this, &SyncBackendHostCore::SaveChanges);
 }
 
 void SyncBackendHostCore::SaveChanges() {
   DCHECK_EQ(base::MessageLoop::current(), sync_loop_);
   sync_manager_->SaveChanges();
 }
 
+void SyncBackendHostCore::DoClearServerData(
+    const syncer::SyncManager::ClearServerDataCallback& frontend_callback) {
+  DCHECK_EQ(base::MessageLoop::current(), sync_loop_);
+  const syncer::SyncManager::ClearServerDataCallback callback =
+      base::Bind(&SyncBackendHostCore::ClearServerDataDone,
+                 weak_ptr_factory_.GetWeakPtr(), frontend_callback);
+  sync_manager_->ClearServerData(callback);
+}
+
+void SyncBackendHostCore::ClearServerDataDone(
+    const base::Closure& frontend_callback) {
+  DCHECK_EQ(base::MessageLoop::current(), sync_loop_);
+  host_.Call(FROM_HERE, &SyncBackendHostImpl::ClearServerDataDoneOnFrontendLoop,
+             frontend_callback);
+}
+
+
 }  // namespace browser_sync