Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/ruby/src/main/java/com/google/protobuf/jruby/RubyRepeatedField.java

 /*
  * Protocol Buffers - Google's data interchange format
  * Copyright 2014 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 92 matching lines @@
     /*
      * call-seq:
      *     RepeatedField.[]=(index, value)
      *
      * Sets the element at the given index. On out-of-bounds assignments, extends
      * the array and fills the hole (if any) with default values.
      */
     @JRubyMethod(name = "[]=")
     public IRubyObject indexSet(ThreadContext context, IRubyObject index, IRubyObject value) {
         int arrIndex = normalizeArrayIndex(index);
-        value = Utils.checkType(context, fieldType, value, (RubyModule) typeClass);
+        Utils.checkType(context, fieldType, value, (RubyModule) typeClass);
         IRubyObject defaultValue = defaultValue(context);
         for (int i = this.storage.size(); i < arrIndex; i++) {
             this.storage.set(i, defaultValue);
         }
         this.storage.set(arrIndex, value);
         return context.runtime.getNil();
     }
 
     /*
      * call-seq:
@@ skipping 35 matching lines @@
     /*
      * call-seq:
      *     RepeatedField.push(value)
      *
      * Adds a new element to the repeated field.
      */
     @JRubyMethod(name = {"push", "<<"})
     public IRubyObject push(ThreadContext context, IRubyObject value) {
         if (!(fieldType == Descriptors.FieldDescriptor.Type.MESSAGE &&
             value == context.runtime.getNil())) {
-            value = Utils.checkType(context, fieldType, value, (RubyModule) typeClass);
+            Utils.checkType(context, fieldType, value, (RubyModule) typeClass);
         }
         this.storage.add(value);
         return this.storage;
     }
 
     /*
      * private Ruby method used by RepeatedField.pop
      */
     @JRubyMethod(visibility = org.jruby.runtime.Visibility.PRIVATE)
     public IRubyObject pop_one(ThreadContext context) {
@@ skipping 220 matching lines @@
         if (arrIndex < 0 && arrSize > 0) {
             arrIndex = arrSize + arrIndex;
         }
         return arrIndex;
     }
 
     private RubyArray storage;
     private Descriptors.FieldDescriptor.Type fieldType;
     private IRubyObject typeClass;
 }