gpu: Allow waiting on sync tokens without sync token client.

services/ui/gpu/gpu_service.cc

Index: services/ui/gpu/gpu_service.cc
diff --git a/services/ui/gpu/gpu_service.cc b/services/ui/gpu/gpu_service.cc
index 2f10a0711f58defb2c27456f18f95e8fcdf4acf8..40b6c4f31b5246a21f1e83156fba3a8f77c56ba8 100644
--- a/services/ui/gpu/gpu_service.cc
+++ b/services/ui/gpu/gpu_service.cc
@@ -83,9 +83,7 @@ void GpuService::InitializeWithHost(mojom::GpuHostPtr gpu_host,
 
   sync_point_manager_ = sync_point_manager;
   if (!sync_point_manager_) {
-    const bool allow_threaded_wait = false;
-    owned_sync_point_manager_ =
-        base::MakeUnique<gpu::SyncPointManager>(allow_threaded_wait);
+    owned_sync_point_manager_ = base::MakeUnique<gpu::SyncPointManager>();
     sync_point_manager_ = owned_sync_point_manager_.get();
   }