Fix dart2js status for raw string test

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 5055 matching lines @@
       GrowableObjectArray::Handle(GrowableObjectArray::New(data.Length()));
   const String& private_key = String::Handle(PrivateKey());
   intptr_t private_len = private_key.Length();
 
   String& blank = String::Handle(String::New(" "));
   String& newline = String::Handle(String::New("\n"));
   String& two_newlines = String::Handle(String::New("\n\n"));
   String& double_quotes = String::Handle(String::New("\""));
   String& dollar = String::Handle(String::New("$"));
   String& two_spaces = String::Handle(String::New("  "));
-  String& raw_string = String::Handle(String::New("@"));
+  String& raw_string = String::Handle(String::New("r"));
 
   Token::Kind curr = iterator.CurrentTokenKind();
   Token::Kind prev = Token::kILLEGAL;
   // Handles used in the loop.
   Object& obj = Object::Handle();
   String& literal = String::Handle();
   // Current indentation level.
   int indent = 0;
 
   while (curr != Token::kEOS) {
@@ skipping 6415 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart