[cleanup][fidl] Remove sync binding reference from generated async class

Change-Id: I56a6d059569224f2e54ce615a4a71a675d420f8f
diff --git a/bin/fidlgen_dart/backend/templates/library.tmpl.go b/bin/fidlgen_dart/backend/templates/library.tmpl.go
index ffe05ec..4433e6c 100644
--- a/bin/fidlgen_dart/backend/templates/library.tmpl.go
+++ b/bin/fidlgen_dart/backend/templates/library.tmpl.go
@@ -110,12 +110,6 @@
 import '{{ .AsyncURL }}' as {{ .LocalName }};
 {{ end -}}
 
-// These imports improve deduplication by making uses of {fidl.dart},
-// {fidl_async.dart} and {fidl.dart, fidl_async.dart} generate equivalent
-// packages. In AOT, the dead code will be removed by tree shaking.
-// ignore: unused_import
-import 'fidl.dart' as $strongly_connect_sync;
-
 // ignore_for_file: always_specify_types
 // ignore_for_file: avoid_positional_boolean_parameters
 // ignore_for_file: avoid_returning_null