Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/js/debug.js

 // 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
 // notice, this list of conditions and the following disclaimer.
@@ skipping 76 matching lines @@
       'Only messages expected: ' + thing);
   var ctor = message.constructor;
   var messageName = ctor.name || ctor.displayName;
   var object = {
     '$name': messageName
   };
   for (var name in ctor.prototype) {
     var match = /^get([A-Z]\w*)/.exec(name);
     if (match && name != 'getExtension' &&
         name != 'getJsPbMessageId') {
-      var has = 'has' + match[1];
-      if (!thing[has] || thing[has]()) {
-        var val = thing[name]();
+      var val = thing[name]();
+      if (val != null) {
         object[jspb.debug.formatFieldName_(match[1])] = jspb.debug.dump_(val);
       }
     }
   }
   if (COMPILED && thing['extensionObject_']) {
     object['$extensions'] = 'Recursive dumping of extensions not supported ' +
         'in compiled code. Switch to uncompiled or dump extension object ' +
         'directly';
     return object;
   }
@@ skipping 22 matching lines @@
  * @param {string} name Name of the field.
  * @return {string}
  * @private
  */
 jspb.debug.formatFieldName_ = function(name) {
   // Name may be in TitleCase.
   return name.replace(/^[A-Z]/, function(c) {
     return c.toLowerCase();
   });
 };