Update all occurrences of raw strings.

runtime/lib/mirrors_impl.dart

 // 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.
 
 // VM-specific implementation of the dart:mirrors library.
 
 // These values are allowed to be passed directly over the wire.
 bool _isSimpleValue(var value) {
   return (value == null || value is num || value is String || value is bool);
 }
@@ skipping 202 matching lines @@
 // TODO(turnidge): Consider truncating.
 String _dartEscape(String str) {
   bool isNice(int code) => (code >= 32 && code <= 126);
 
   StringBuffer buf = new StringBuffer();
   for (int i = 0; i < str.length; i++) {
     var input = str[i];
     String output;
     switch (input) {
       case '\\' :
-        output = @'\\';
+        output = r'\\';
         break;
       case "\'" :
-        output = @"\'";
+        output = r"\'";
         break;
       case '\n' :
-        output = @'\n';
+        output = r'\n';
         break;
       case '\r' :
-        output = @'\r';
+        output = r'\r';
         break;
       case '\f' :
-        output = @'\f';
+        output = r'\f';
         break;
       case '\b' :
-        output = @'\b';
+        output = r'\b';
         break;
       case '\t' :
-        output = @'\t';
+        output = r'\t';
         break;
       case '\v' :
-        output = @'\v';
+        output = r'\v';
         break;
       default:
         int code = input.charCodeAt(0);
         if (isNice(code)) {
           output = input;
         } else {
           output = '\\u{${code.toRadixString(16)}}';
         }
         break;
     }
@@ skipping 708 matching lines @@
 
   // Creates a new local InstanceMirror
   static InstanceMirror makeLocalInstanceMirror(Object reflectee)
       native 'Mirrors_makeLocalInstanceMirror';
 
   // Creates a new local mirror for some Object.
   static InstanceMirror reflect(Object reflectee) {
     return makeLocalInstanceMirror(reflectee);
   }
 }