Remove some additional code that depended on the old type propagation.

pkg/kernel/testcases/type-propagation/void-methods.baseline.txt

-library;
-import self as self;
-import "dart:core" as core;
-
-class Foo extends core::Object {
-  field core::List<dynamic>/core::List* {other} list = <dynamic>[1, 2, 3];
-  constructor •() → void
-    : super core::Object::•()
-    ;
-  set first(dynamic/core::int* {int} x) → dynamic/Null
-    this.list.[]=(0, x);
-  operator []=(dynamic/core::int* {int} x, dynamic/core::int* {int} y) → dynamic/Null
-    this.list.[]=(x, y);
-  method clear() → void/Null
-    return this.list.clear();
-}
-static method main() → dynamic/Null {
-  new self::Foo::•().first = 4;
-  new self::Foo::•().[]=(3, 4);
-  new self::Foo::•().clear();
-}