Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/ruby/src/main/java/com/google/protobuf/jruby/RubyMap.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 130 matching lines @@
     /*
      * call-seq:
      *     Map.[]=(key, value) => value
      *
      * Inserts or overwrites the value at the given key with the given new value.
      * Throws an exception if the key type is incorrect. Returns the new value that
      * was just inserted.
      */
     @JRubyMethod(name = "[]=")
     public IRubyObject indexSet(ThreadContext context, IRubyObject key, IRubyObject value) {
-        key = Utils.checkType(context, keyType, key, (RubyModule) valueTypeClass);
-        value = Utils.checkType(context, valueType, value, (RubyModule) valueTypeClass);
+        Utils.checkType(context, keyType, key, (RubyModule) valueTypeClass);
+        Utils.checkType(context, valueType, value, (RubyModule) valueTypeClass);
         IRubyObject symbol;
         if (valueType == Descriptors.FieldDescriptor.Type.ENUM &&
                 Utils.isRubyNum(value) &&
                 ! (symbol = RubyEnum.lookup(context, valueTypeClass, value)).isNil()) {
             value = symbol;
         }
         this.table.put(key, value);
         return value;
     }
 
@@ skipping 262 matching lines @@
             default:
                 return false;
         }
     }
 
     private Descriptors.FieldDescriptor.Type keyType;
     private Descriptors.FieldDescriptor.Type valueType;
     private IRubyObject valueTypeClass;
     private Map<IRubyObject, IRubyObject> table;
 }