Revert "reflectType() dynamic type arguments support (#26012)"

sdk/lib/_internal/js_runtime/lib/mirrors_patch.dart

Index: sdk/lib/_internal/js_runtime/lib/mirrors_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/mirrors_patch.dart b/sdk/lib/_internal/js_runtime/lib/mirrors_patch.dart
index c37004307758368cb32977a7806f5243916c235f..eb6319c591d9f7d977ba472d608697c325b30708 100644
--- a/sdk/lib/_internal/js_runtime/lib/mirrors_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/mirrors_patch.dart
@@ -43,9 +43,9 @@ ClassMirror reflectClass(Type key) {
 }
 
 @patch
-TypeMirror reflectType(Type key, [List<Type> typeArguments]) {
+TypeMirror reflectType(Type key) {
   if (key == dynamic) {
     return currentMirrorSystem().dynamicType;
   }
-  return js.reflectType(key, typeArguments);
+  return js.reflectType(key);
 }