Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

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

Index: third_party/protobuf/java/core/src/test/java/com/google/protobuf/TestUtil.java
diff --git a/third_party/protobuf/java/core/src/test/java/com/google/protobuf/TestUtil.java b/third_party/protobuf/java/core/src/test/java/com/google/protobuf/TestUtil.java
index d4a18a22ba612e88ab18ebabf6c79bdc23fc070f..08b2a76d925e07b7eb52599036a4b344a941f453 100644
--- a/third_party/protobuf/java/core/src/test/java/com/google/protobuf/TestUtil.java
+++ b/third_party/protobuf/java/core/src/test/java/com/google/protobuf/TestUtil.java
@@ -232,10 +232,12 @@ import protobuf_unittest.UnittestProto.TestOneof2;
 import protobuf_unittest.UnittestProto.TestPackedExtensions;
 import protobuf_unittest.UnittestProto.TestPackedTypes;
 import protobuf_unittest.UnittestProto.TestUnpackedTypes;
+
+import junit.framework.Assert;
+
 import java.io.File;
 import java.io.IOException;
 import java.io.RandomAccessFile;
-import junit.framework.Assert;
 
 /**
  * Contains methods for setting all fields of {@code TestAllTypes} to
@@ -258,13 +260,6 @@ public final class TestUtil {
   }
 
   /**
-   * Dirties the message by resetting the momoized serialized size.
-   */
-  public static void resetMemoizedSize(AbstractMessage message) {
-    message.memoizedSize = -1;
-  }
-
-  /**
    * Get a {@code TestAllTypes} with all fields set as they would be by
    * {@link #setAllFields(TestAllTypes.Builder)}.
    */
@@ -3769,8 +3764,7 @@ public final class TestUtil {
 
   private static File getTestDataDir() {
     // Search each parent directory looking for "src/google/protobuf".
-    File ancestor = new File(System.getProperty("protobuf.dir", "."));
-    String initialPath = ancestor.getAbsolutePath();
+    File ancestor = new File(".");
     try {
       ancestor = ancestor.getCanonicalFile();
     } catch (IOException e) {
@@ -3787,7 +3781,7 @@ public final class TestUtil {
     throw new RuntimeException(
       "Could not find golden files.  This test must be run from within the " +
       "protobuf source package so that it can read test data files from the " +
-      "C++ source tree: " + initialPath);
+      "C++ source tree.");
   }
 
   /**