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

third_party/protobuf/src/google/protobuf/unittest.proto

 // 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 678 matching lines @@
   oneof foo {
     int32 foo_int = 1;
     string foo_string = 2;
     NestedMessage foo_message = 3;
   }
   message NestedMessage {
     required double required_double = 1;
   }
 }
 
+
 // Test messages for packed fields
 
 message TestPackedTypes {
   repeated    int32 packed_int32    =  90 [packed = true];
   repeated    int64 packed_int64    =  91 [packed = true];
   repeated   uint32 packed_uint32   =  92 [packed = true];
   repeated   uint64 packed_uint64   =  93 [packed = true];
   repeated   sint32 packed_sint32   =  94 [packed = true];
   repeated   sint64 packed_sint64   =  95 [packed = true];
   repeated  fixed32 packed_fixed32  =  96 [packed = true];
@@ skipping 160 matching lines @@
 
 service TestService {
   rpc Foo(FooRequest) returns (FooResponse);
   rpc Bar(BarRequest) returns (BarResponse);
 }
 
 
 message BarRequest  {}
 message BarResponse {}