third_party/protobuf: Update to HEAD (f52e188fe4)

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

Index: third_party/protobuf/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
diff --git a/third_party/protobuf/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java b/third_party/protobuf/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
index a9b8b6381a490e242177b70e8ef0a4948d4cc105..3eece26a4a72e654685dd3bf02dff56727014c82 100644
--- a/third_party/protobuf/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
+++ b/third_party/protobuf/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
@@ -65,9 +65,6 @@ import protobuf_unittest.UnittestProto.TestExtremeDefaultValues;
 import protobuf_unittest.UnittestProto.TestOneof2;
 import protobuf_unittest.UnittestProto.TestPackedTypes;
 import protobuf_unittest.UnittestProto.TestUnpackedTypes;
-
-import junit.framework.TestCase;
-
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.ObjectInputStream;
@@ -76,6 +73,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
+import junit.framework.TestCase;
 
 /**
  * Unit test for generated messages and generated code.  See also
@@ -972,7 +970,7 @@ public class GeneratedMessageTest extends TestCase {
     TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
 
     TestAllTypes.Builder builder = (TestAllTypes.Builder)
-        ((GeneratedMessage) TestAllTypes.getDefaultInstance()).
+        ((AbstractMessage) TestAllTypes.getDefaultInstance()).
             newBuilderForType(mockParent);
     builder.setOptionalInt32(1);
     builder.setOptionalNestedEnum(TestAllTypes.NestedEnum.BAR);
@@ -1027,7 +1025,7 @@ public class GeneratedMessageTest extends TestCase {
     TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
 
     TestAllExtensions.Builder builder = (TestAllExtensions.Builder)
-        ((GeneratedMessage) TestAllExtensions.getDefaultInstance()).
+        ((AbstractMessage) TestAllExtensions.getDefaultInstance()).
             newBuilderForType(mockParent);
 
     builder.addExtension(UnittestProto.repeatedInt32Extension, 1);