third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/objectivec/Tests/unittest_extension_chain_b.proto

Index: third_party/protobuf/objectivec/Tests/unittest_extension_chain_b.proto
diff --git a/third_party/protobuf/src/google/protobuf/util/internal/testdata/struct.proto b/third_party/protobuf/objectivec/Tests/unittest_extension_chain_b.proto
similarity index 77%
copy from third_party/protobuf/src/google/protobuf/util/internal/testdata/struct.proto
copy to third_party/protobuf/objectivec/Tests/unittest_extension_chain_b.proto
index c15aba0d6d9881b8963a0353cdd1e0aa0b4adc11..0da7ed3e4c37bd5e7cf3f6ec7fe23302f831e444 100644
--- a/third_party/protobuf/src/google/protobuf/util/internal/testdata/struct.proto
+++ b/third_party/protobuf/objectivec/Tests/unittest_extension_chain_b.proto
@@ -1,6 +1,5 @@
 // Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+// Copyright 2016 Google Inc.  All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,18 +27,21 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Proto to test proto3 struct.
-syntax = "proto3";
+syntax = "proto2";
 
-package google.protobuf.testing.structs;
-option java_package = "com.google.protobuf.testing.structs";
+package protobuf_unittest;
 
-import "google/protobuf/struct.proto";
+import "google/protobuf/unittest.proto";
 
-message StructType {
-  google.protobuf.Struct object = 1;
+import "unittest_extension_chain_c.proto";
+
+// The Root for this file should end up adding the local extension and merging
+// in the extensions from C's Root (unittest will come via C's).
+
+message ChainBMessage {
+  optional ChainCMessage c = 1;
 }
 
-service TestService {
-  rpc Call(StructType) returns (StructType);
+extend TestAllExtensions {
+  optional int32 chain_b_extension = 10002;
 }