Migrate test block 30 + corelib portion of block 31 to Dart 2.0.

tests/corelib_strong/type_hashcode_test.dart

Index: tests/corelib_strong/type_hashcode_test.dart
diff --git a/tests/corelib_strong/type_hashcode_test.dart b/tests/corelib_strong/type_hashcode_test.dart
deleted file mode 100644
index 49c9ab8f97cbe62008fea16d60dfbdbe0c4149bc..0000000000000000000000000000000000000000
--- a/tests/corelib_strong/type_hashcode_test.dart
+++ /dev/null
@@ -1,11 +0,0 @@
-import "package:expect/expect.dart";
-
-void main() {
-  var h = "hello", w = "world";
-  Expect.notEquals(h.hashCode, w.hashCode);
-  Expect.notEquals((String).hashCode, (int).hashCode);
-  var c = h.runtimeType.hashCode;
-  Expect.isTrue(c is int);
-  Expect.notEquals(c, null);
-  Expect.notEquals(c, 0);
-}