Remove code associated with the old "kompile" functionality.

pkg/front_end/testcases/casts.dart.dartk.expect

Index: pkg/front_end/testcases/casts.dart.dartk.expect
diff --git a/pkg/front_end/testcases/casts.dart.dartk.expect b/pkg/front_end/testcases/casts.dart.dartk.expect
deleted file mode 100644
index c75d8ec820bf98d784206c6bd6d0e9bc98d86c82..0000000000000000000000000000000000000000
--- a/pkg/front_end/testcases/casts.dart.dartk.expect
+++ /dev/null
@@ -1,18 +0,0 @@
-library;
-import self as self;
-import "dart:core" as core;
-
-static method main() → dynamic {
-  core::print("" as core::String);
-  core::print(1 as core::int);
-  core::print(1.0 as core::double);
-  core::print("" is core::String);
-  core::print("" is core::int);
-  core::print("" is core::double);
-  core::print(1 is core::String);
-  core::print(1 is core::int);
-  core::print(1 is core::double);
-  core::print(1.0 is core::String);
-  core::print(1.0 is core::int);
-  core::print(1.0 is core::double);
-}