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

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

Index: pkg/kernel/testcases/type-propagation/external.baseline.txt
diff --git a/pkg/kernel/testcases/type-propagation/external.baseline.txt b/pkg/kernel/testcases/type-propagation/external.baseline.txt
deleted file mode 100644
index c80d0b440e45c15f7f5156423b7020380d347cad..0000000000000000000000000000000000000000
--- a/pkg/kernel/testcases/type-propagation/external.baseline.txt
+++ /dev/null
@@ -1,16 +0,0 @@
-library;
-import self as self;
-import "dart:core" as core;
-import "dart:isolate" as iso;
-
-static field dynamic/dart.async::StreamSubscription* {null,other} subscription = null;
-static method onData(dynamic/core::Object* {*} x) → void/Null {
-  core::print(x);
-  self::subscription.cancel();
-}
-static method main() → dynamic/Null {
-  dynamic/core::String* {string} string = core::String::fromCharCode(65);
-  dynamic/iso::ReceivePort* {other} port = iso::ReceivePort::•();
-  self::subscription = port.listen(self::onData);
-  port.sendPort.send(string);
-}