compos_bench: Remove empty cleanup() function

Test: m ComposBenchmarkApp
Change-Id: If90832b457000f37217867ad87b53d78897b323d
diff --git a/compos/benchmark/src/java/com/android/compos/benchmark/ComposBenchmark.java b/compos/benchmark/src/java/com/android/compos/benchmark/ComposBenchmark.java
index f4bc3b6..20b3585 100644
--- a/compos/benchmark/src/java/com/android/compos/benchmark/ComposBenchmark.java
+++ b/compos/benchmark/src/java/com/android/compos/benchmark/ComposBenchmark.java
@@ -24,7 +24,6 @@
 import android.os.ParcelFileDescriptor;
 import android.util.Log;
 
-import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -56,11 +55,6 @@
         mInstrumentation = getInstrumentation();
     }
 
-    @After
-    public void cleanup() {
-
-    }
-
     public byte[] executeCommandBlocking(String command) {
         try (
             InputStream is = new ParcelFileDescriptor.AutoCloseInputStream(