Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/java/core/src/test/java/com/google/protobuf/NestedBuildersTest.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 14 matching lines @@
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 package com.google.protobuf;
 
 import protobuf_unittest.Vehicle;
 import protobuf_unittest.Wheel;
+
+import junit.framework.TestCase;
+
 import java.util.ArrayList;
 import java.util.List;
-import junit.framework.TestCase;
 
 /**
  * Test cases that exercise end-to-end use cases involving
  * {@link SingleFieldBuilder} and {@link RepeatedFieldBuilder}.
  *
  * @author jonp@google.com (Jon Perlow)
  */
 public class NestedBuildersTest extends TestCase {
 
   public void testMessagesAndBuilders() {
@@ skipping 126 matching lines @@
     assertSame(vehicle1.getWheelList(), vehicle3.getWheelList());
   }
 
   public void testGettingBuilderMarksFieldAsHaving() {
     Vehicle.Builder vehicleBuilder = Vehicle.newBuilder();
     vehicleBuilder.getEngineBuilder();
     Vehicle vehicle = vehicleBuilder.buildPartial();
     assertTrue(vehicle.hasEngine());
   }
 }