Remove metric key constants from JankTestBase.

Change-Id: I74c7a2021b08109a5878ce4c388bf5d01e845ab6
diff --git a/src/android/support/test/jank/JankTestBase.java b/src/android/support/test/jank/JankTestBase.java
index 1439da0..bb2605d 100644
--- a/src/android/support/test/jank/JankTestBase.java
+++ b/src/android/support/test/jank/JankTestBase.java
@@ -44,11 +44,6 @@
  */
 public class JankTestBase extends InstrumentationTestCase {
 
-    public static final String KEY_AVG_JANK = "avg-jank";
-    public static final String KEY_MAX_JANK = "max-jank";
-    public static final String KEY_AVG_FPS = "avg-fps";
-    public static final String KEY_AVG_MAX_FRAME_DURATION = "avg-max-frame-duration";
-
     private Bundle arguments = null;
     private int mCurrentIteration = 0;