[ VM ] Fixed data_uri_import_test which was never migrated properly to Dart 2

Change-Id: I3aa1d5b63b1815920f46691d0b5b5110d144a80b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/105324
Reviewed-by: Ryan Macnak <[email protected]>
Commit-Queue: Ben Konyi <[email protected]>

Author: bkonyi

runtime/tests/vm/dart/data_uri_import_test.dart

@@ -6,13 +6,13 @@
 import 'data:application/dart;charset=utf-8,foo%28%29%20%3D%3E%2042%3B';  /// percentencoded: ok
 import 'data:text/plain;charset=utf-8,foo%28%29%20%3D%3E%2042%3B';  /// wrongmime: ok
 import 'data:;charset=utf-8,foo%28%29%20%3D%3E%2042%3B';  /// nomime: ok
-import 'data:application/dart;charset=utf-16,foo%28%29%20%3D%3E%2042%3B';  /// utf16: runtime error
+import 'data:application/dart;charset=utf-16,foo%28%29%20%3D%3E%2042%3B';  /// utf16: ok
 import 'data:application/dart,foo%28%29%20%3D%3E%2042%3B';  /// nocharset: ok
-import 'data:application/dart;charset=utf-8,foo?%9g';  /// badencodeddate: runtime error
+import 'data:application/dart;charset=utf-8,foo?%9g';  /// badencodeddate: compile-time error
 import 'data:application/dart;charset=utf-8;base64,Zm9vKCkgPT4gNDI7';  /// base64: ok
 
 import "package:expect/expect.dart";
 
 main() {
   Expect.equals(42, foo());
-}
+}