[Sync] Clean up ProfileSyncService observer events

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 cbded53f8b5b9e8899f2b4714816177faa211cb5..edf1097819e4b18093af297da5802d2979f308c6 100644
--- a/chrome/browser/sync/glue/sync_backend_host_impl.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_impl.cc
@@ -626,14 +626,6 @@ void SyncBackendHostImpl::AddExperimentalTypes() {
     frontend_->OnExperimentsChanged(experiments);
 }
 
-void SyncBackendHostImpl::HandleControlTypesDownloadRetry() {
-  DCHECK_EQ(base::MessageLoop::current(), frontend_loop_);
-  if (!frontend_)
-    return;
-
-  frontend_->OnSyncConfigureRetry();
-}
-
 void SyncBackendHostImpl::HandleInitializationSuccessOnFrontendLoop(
     const syncer::WeakHandle<syncer::JsBackend> js_backend,
     const syncer::WeakHandle<syncer::DataTypeDebugInfoListener>