Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/js/test2.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 17 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 syntax = "proto2";
 
 option java_package = "com.google.apps.jspb.proto";
 option java_multiple_files = true;
 
 package jspb.test;
 
-import "test.proto";
-
 message TestExtensionsMessage {
   optional int32 intfield = 1;
   extensions 100 to max;
 }
 
 message ExtensionMessage {
   extend TestExtensionsMessage {
     optional ExtensionMessage ext_field = 100;
   }
   optional string ext1 = 1;
 }
 
 // Floating extensions are only supported when generating a _lib.js library.
 extend TestExtensionsMessage {
   optional ExtensionMessage floating_msg_field = 101;
   optional string floating_str_field = 102;
 }
-
-message ForeignNestedFieldMessage {
-  optional Deeply.Nested.Message deeply_nested_message = 1;
-}