Prevent double reporting on hex, strings, and multiline comments.

tests/language/bad_raw_string_negative_test.dart

Index: tests/language/bad_raw_string_negative_test.dart
diff --git a/tests/compiler/dart2js/path with spaces/file with spaces.dart b/tests/language/bad_raw_string_negative_test.dart
similarity index 73%
copy from tests/compiler/dart2js/path with spaces/file with spaces.dart
copy to tests/language/bad_raw_string_negative_test.dart
index b0cc20402f823946fa54730f2bb581c9bf58365a..89b4659e838edb25d917724b0853233f308f67c3 100644
--- a/tests/compiler/dart2js/path with spaces/file with spaces.dart	
+++ b/tests/language/bad_raw_string_negative_test.dart
@@ -2,8 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'library space/lib with spaces.dart';
-
 main() {
-  if (foo() != 499) throw "bad value";
+  // Raw String may not contain newline (may not be multi-line).
+  print(r'
+');
 }