Use correct class name (UnsupportedError instead of UnsupportedOperation) in test

tests/standalone/io/link_uri_test.dart

Index: tests/standalone/io/link_uri_test.dart
diff --git a/tests/standalone/io/link_uri_test.dart b/tests/standalone/io/link_uri_test.dart
index 8af5269667cbdeb7e01b7359e588da2f54816207..f3474068f3dad15cc52cf4b0987ad4691fdf948b 100644
--- a/tests/standalone/io/link_uri_test.dart
+++ b/tests/standalone/io/link_uri_test.dart
@@ -34,11 +34,11 @@ void testFromUri() {
 void testFromUriUnsupported() {
   Expect.throws(
       () => new Link.fromUri(Uri.parse('http://localhost:8080/index.html')),
-      (e) => e is UnsupportedOperation);
+      (e) => e is UnsupportedError);
   Expect.throws(() => new Link.fromUri(Uri.parse('ftp://localhost/tmp/xxx')),
-                (e) => e is UnsupportedOperation);
+                (e) => e is UnsupportedError);
   Expect.throws(() => new Link.fromUri(Uri.parse('name#fragment')),
-                (e) => e is UnsupportedOperation);
+                (e) => e is UnsupportedError);
 }
 
 void main() {