Update all occurrences of raw strings.

tests/language/string_escapes_test.dart

Index: tests/language/string_escapes_test.dart
diff --git a/tests/language/string_escapes_test.dart b/tests/language/string_escapes_test.dart
index 8f711c29f327926190b14991c18db1b3c27bad5f..20a7beb4f77f22343efbfc43537ae25afc443c20 100644
--- a/tests/language/string_escapes_test.dart
+++ b/tests/language/string_escapes_test.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
@@ -56,7 +56,7 @@ class StringEscapesTest {
 
   static testLiteral() {
     String str = "\a\c\d\e\g\h\i\j\k\l\$\{\}\"";
-    Expect.equals(@'acdeghijkl${}"', str);
+    Expect.equals(r'acdeghijkl${}"', str);
   }
 }