Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java

 // 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 20 matching lines @@
 package com.google.protobuf;
 
 import protobuf_unittest.UnittestProto;
 import protobuf_unittest.UnittestProto.ForeignEnum;
 import protobuf_unittest.UnittestProto.TestAllExtensions;
 import protobuf_unittest.UnittestProto.TestAllTypes;
 import protobuf_unittest.UnittestProto.TestEmptyMessage;
 import protobuf_unittest.UnittestProto.TestEmptyMessageWithExtensions;
 import protobuf_unittest.UnittestProto.TestPackedExtensions;
 import protobuf_unittest.UnittestProto.TestPackedTypes;
+
+import junit.framework.TestCase;
+
 import java.util.Arrays;
 import java.util.Map;
-import junit.framework.TestCase;
 
 /**
  * Tests related to unknown field handling.
  *
  * @author kenton@google.com (Kenton Varda)
  */
 public class UnknownFieldSetTest extends TestCase {
   @Override
   public void setUp() throws Exception {
     descriptor = TestAllTypes.getDescriptor();
@@ skipping 589 matching lines @@
         UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
     UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
         UnittestLite.TestEmptyMessageLite.newBuilder()
         .mergeFrom(emptyMessageLite1).clear().build();
     assertEquals(0, emptyMessageLite2.getSerializedSize());
     ByteString data = emptyMessageLite2.toByteString();
     assertEquals(0, data.size());
   }
 
 }