Small fixes to top level type inference.

pkg/front_end/testcases/inference_new/unsafe_block_closure_inference_function_call_explicit_type_param_via_expr2.dart.direct.expect

 library test;
 import self as self;
 import "dart:core" as core;
 
-static field dynamic v = self::f.call(() → core::int {
+static field dynamic v = self::f.call(() → dynamic {
   return 1;
 });
 static method f<T extends core::Object>(() → self::f::T g) → core::List<self::f::T>
   return <self::f::T>[g.call()];
 static method main() → dynamic {
   self::v;
 }