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

third_party/protobuf/objectivec/Tests/GPBWireFormatTests.m

 // 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 172 matching lines @@
 - (void)testParseMessageSet {
   // Set up a RawMessageSet with two known messages and an unknown one.
   RawMessageSet* raw = [RawMessageSet message];
 
   {
     RawMessageSet_Item* item = [RawMessageSet_Item message];
     item.typeId = [TestMessageSetExtension1 messageSetExtension].fieldNumber;
     TestMessageSetExtension1* message = [TestMessageSetExtension1 message];
     message.i = 123;
     item.message = [message data];
-    raw.itemArray = [NSMutableArray array];
     [raw.itemArray addObject:item];
   }
 
   {
     RawMessageSet_Item* item = [RawMessageSet_Item message];
     item.typeId = [TestMessageSetExtension2 messageSetExtension].fieldNumber;
     TestMessageSetExtension2* message = [TestMessageSetExtension2 message];
     message.str = @"foo";
     item.message = [message data];
     [raw.itemArray addObject:item];
@@ skipping 40 matching lines @@
     if (tag == 0) {
       break;
     }
 
     XCTAssertGreaterThan(tag, previousTag);
     [input skipField:tag];
   }
 }
 
 @end