Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/csharp/src/AddressBook/AddPerson.cs

 #region Copyright notice and license
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
@@ skipping 55 matching lines @@
                     break;
                 }
 
                 Person.Types.PhoneNumber phoneNumber = new Person.Types.PhoneNumber { Number = number };
 
                 output.Write("Is this a mobile, home, or work phone? ");
                 String type = input.ReadLine();
                 switch (type)
                 {
                     case "mobile":
-                        phoneNumber.Type = Person.Types.PhoneType.MOBILE;
+                        phoneNumber.Type = Person.Types.PhoneType.Mobile;
                         break;
                     case "home":
-                        phoneNumber.Type = Person.Types.PhoneType.HOME;
+                        phoneNumber.Type = Person.Types.PhoneType.Home;
                         break;
                     case "work":
-                        phoneNumber.Type = Person.Types.PhoneType.WORK;
+                        phoneNumber.Type = Person.Types.PhoneType.Work;
                         break;
                     default:
                         output.Write("Unknown phone type. Using default.");
                         break;
                 }
 
                 person.Phones.Add(phoneNumber);
             }
             return person;
         }
@@ skipping 30 matching lines @@
 
             // Write the new address book back to disk.
             using (Stream output = File.OpenWrite(args[0]))
             {
                 addressBook.WriteTo(output);
             }
             return 0;
         }
     }
 }