Remove deprecated APIs.

test/sha256_test.dart

Index: test/sha256_test.dart
diff --git a/test/sha256_test.dart b/test/sha256_test.dart
index c2b6d3e130efe692aee1c9bb678db9ea9e23c253..75fb9e30f855d9f6e61a29760aa0644daa7bf5ec 100644
--- a/test/sha256_test.dart
+++ b/test/sha256_test.dart
@@ -10,22 +10,6 @@ import "package:crypto/crypto.dart";
 import "utils.dart";
 
 void main() {
-  group("with the old API", () {
-    test('add may not be called after close', () {
-      var sha = new SHA256();
-      sha.close();
-      expect(() => sha.add([0]), throwsStateError);
-    });
-
-    test('close returns the same digest repeatedly', () {
-      var sha = new SHA256();
-      var digest = sha.close();
-      expect(sha.close(), equals(digest));
-      expect(sha.close(), equals(digest));
-      expect(sha.close(), equals(digest));
-    });
-  });
-
   group("with a chunked converter", () {
     test('add may not be called after close', () {
       var sink = sha256.startChunkedConversion(new StreamController().sink);