Deletes CODEC fields now that they are no longer needed.

PiperOrigin-RevId: 187397314
diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/TreeArtifactBuildTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/TreeArtifactBuildTest.java
index b15782c..a7b4602 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/TreeArtifactBuildTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/TreeArtifactBuildTest.java
@@ -50,7 +50,7 @@
 import com.google.devtools.build.lib.events.Event;
 import com.google.devtools.build.lib.events.EventKind;
 import com.google.devtools.build.lib.events.StoredEventHandler;
-import com.google.devtools.build.lib.skyframe.serialization.testutils.ObjectCodecTester;
+import com.google.devtools.build.lib.skyframe.serialization.testutils.SerializationTester;
 import com.google.devtools.build.lib.testutil.TestUtils;
 import com.google.devtools.build.lib.vfs.FileStatus;
 import com.google.devtools.build.lib.vfs.FileSystem;
@@ -115,10 +115,9 @@
 
   @Test
   public void testCodec() throws Exception {
-    ObjectCodecTester.newBuilder(Artifact.CODEC)
-        .addSubjects(outOne, outOneFileOne)
+    new SerializationTester(outOne, outOneFileOne)
         .addDependency(FileSystem.class, scratch.getFileSystem())
-        .buildAndRunTests();
+        .runTests();
   }
 
   /** Simple smoke test. If this isn't passing, something is very wrong... */