Implement more fixes.

pkg/analysis_services/lib/src/correction/strings.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library services.src.correction.strings;
 
 
@@ skipping 40 matching lines @@
 String removeStart(String str, String remove) {
   if (isEmpty(str) || isEmpty(remove)) {
     return str;
   }
   if (str.startsWith(remove)) {
     return str.substring(remove.length);
   }
   return str;
 }
 
+int compareStrings(String a, String b) {
+  if (a == b) {
+    return 0;
+  }
+  if (a == null) {
+    return 1;
+  }
+  if (b == null) {
+    return -1;
+  }
+  return a.compareTo(b);
+}
+
 String repeat(String s, int n) {
   StringBuffer sb = new StringBuffer();
   for (int i = 0; i < n; i++) {
     sb.write(s);
   }
   return sb.toString();
 }