[Sync] Update SyncBackendHost to forward ClearServerData to SyncManager

chrome/browser/sync/glue/sync_backend_host_impl.cc

Index: chrome/browser/sync/glue/sync_backend_host_impl.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_impl.cc b/chrome/browser/sync/glue/sync_backend_host_impl.cc
index 833a9d978897c31c7896f3cd212e32a75d3c608c..75ada092ee0a79a3b62d756af9650b76d256324e 100644
--- a/chrome/browser/sync/glue/sync_backend_host_impl.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_impl.cc
@@ -872,6 +872,20 @@ void SyncBackendHostImpl::RefreshTypesForTest(syncer::ModelTypeSet types) {
       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