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

pkg/kernel/testcases/type-propagation/static_setter.baseline.txt

Index: pkg/kernel/testcases/type-propagation/static_setter.baseline.txt
diff --git a/pkg/kernel/testcases/type-propagation/static_setter.baseline.txt b/pkg/kernel/testcases/type-propagation/static_setter.baseline.txt
deleted file mode 100644
index 6bf6f26c3b25eb6f4fdd9b673eff8f4a4b5740e0..0000000000000000000000000000000000000000
--- a/pkg/kernel/testcases/type-propagation/static_setter.baseline.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-library;
-import self as self;
-import "dart:core" as core;
-
-class Foo extends core::Object {
-  constructor •() → void
-    : super core::Object::•()
-    ;
-}
-static set foo(dynamic/self::Foo! {other} x) → dynamic/Null {}
-static method main() → dynamic/Null {
-  self::foo = new self::Foo::•();
-}