Fixing formatting

Author: jposuna

firebase-perf/src/test/java/com/google/firebase/perf/config/DeviceCacheManagerTest.java

@@ -18,7 +18,6 @@
 
 import android.content.Context;
 import android.content.SharedPreferences;
-
 import com.google.firebase.FirebaseApp;
 import com.google.firebase.perf.FirebasePerformanceTestBase;
 import com.google.firebase.perf.util.Constants;