Make SystraceRequestListener extend BaseRequestListener

Summary: Instead of `SystraceRequestListener` implementing `RequestListener`, this diff instead extends the base implementation.

Reviewed By: massimocarli

Differential Revision: D4796679

fbshipit-source-id: 0c9a0b755f4beff69007688962682989e5af72e0

Author: kirwan

ReactAndroid/src/main/java/com/facebook/react/modules/fresco/SystraceRequestListener.java

@@ -7,14 +7,14 @@
 
 import android.util.Pair;
 
-import com.facebook.imagepipeline.listener.RequestListener;
+import com.facebook.imagepipeline.listener.BaseRequestListener;
 import com.facebook.imagepipeline.request.ImageRequest;
 import com.facebook.systrace.Systrace;
 
 /**
  * Logs requests to Systrace
  */
-public class SystraceRequestListener implements RequestListener {
+public class SystraceRequestListener extends BaseRequestListener {
 
   int mCurrentID = 0;
   Map<String, Pair<Integer,String>> mProducerID = new HashMap<>();