Disable type erasure during strong mode tests.

pkg/front_end/testcases/inference/infer_return_of_statement_lambda.dart.strong.expect

Index: pkg/front_end/testcases/inference/infer_return_of_statement_lambda.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/infer_return_of_statement_lambda.dart.strong.expect b/pkg/front_end/testcases/inference/infer_return_of_statement_lambda.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..5e931e5caf88087aef874a19c7564e306eb54f6b
--- /dev/null
+++ b/pkg/front_end/testcases/inference/infer_return_of_statement_lambda.dart.strong.expect
@@ -0,0 +1,13 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+static method strings() → core::List<core::String> {
+  core::Iterable<core::String> stuff = <dynamic>[].{core::Iterable::expand}<core::String>((dynamic i) → core::List<core::String> {
+    return <core::String>[];
+  });
+  return stuff.{core::Iterable::toList}();
+}
+static method main() → dynamic {
+  self::strings();
+}