Get rid of promotedType=none annotations

pkg/front_end/testcases/inference/generic_methods_do_not_infer_invalid_override_of_generic_method.dart

Index: pkg/front_end/testcases/inference/generic_methods_do_not_infer_invalid_override_of_generic_method.dart
diff --git a/pkg/front_end/testcases/inference/generic_methods_do_not_infer_invalid_override_of_generic_method.dart b/pkg/front_end/testcases/inference/generic_methods_do_not_infer_invalid_override_of_generic_method.dart
index c6ce8f0e25cf7b990424c8b96998e9280f06eba9..4364e7fb6a2dd1a3c1f389de01f018b22e15f224 100644
--- a/pkg/front_end/testcases/inference/generic_methods_do_not_infer_invalid_override_of_generic_method.dart
+++ b/pkg/front_end/testcases/inference/generic_methods_do_not_infer_invalid_override_of_generic_method.dart
@@ -6,16 +6,16 @@
 library test;
 
 class C {
-  T m<T>(T x) => /*@promotedType=none*/ x;
+  T m<T>(T x) => x;
 }
 
 class D extends C {
-/*error:INVALID_METHOD_OVERRIDE*/ m(x) => /*@promotedType=none*/ x;
+/*error:INVALID_METHOD_OVERRIDE*/ m(x) => x;
 }
 
 main() {
   int y = /*info:DYNAMIC_CAST*/ new D()
       . /*error:WRONG_NUMBER_OF_TYPE_ARGUMENTS_METHOD*/ /*@target=D::m*/ m<int>(
           42);
-  print(/*@promotedType=none*/ y);
+  print(y);
 }