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

third_party/protobuf/objectivec/Tests/GPBMessageTests+Runtime.m

 // Protocol Buffers - Google's data interchange format
 // Copyright 2015 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 2056 matching lines @@
 }
 
 #pragma mark - Subset from from map_tests.cc
 
 // TEST(GeneratedMapFieldTest, IsInitialized)
 - (void)testMap_IsInitialized {
   TestRequiredMessageMap *msg = [[TestRequiredMessageMap alloc] init];
 
   // Add an uninitialized message.
   TestRequired *subMsg = [[TestRequired alloc] init];
-  msg.mapField = [GPBInt32ObjectDictionary dictionary];
   [msg.mapField setObject:subMsg forKey:0];
   XCTAssertFalse(msg.initialized);
 
   // Initialize uninitialized message
   subMsg.a = 0;
   subMsg.b = 0;
   subMsg.c = 0;
   XCTAssertTrue(msg.initialized);
 
   [subMsg release];
   [msg release];
 }
 
 @end