Fix unit test

Author: tejasd

firebase-perf/src/main/java/com/google/firebase/perf/session/SessionManager.java

@@ -29,7 +29,6 @@
 import java.util.Objects;
 import java.util.Set;
 import java.util.UUID;
-import java.util.concurrent.Future;
 
 /** Session manager to generate sessionIDs and broadcast to the application. */
 @Keep // Needed because of b/117526359.
@@ -43,7 +42,6 @@ public class SessionManager {
   private final Set<WeakReference<SessionAwareObject>> clients = new HashSet<>();
 
   private PerfSession perfSession;
-  private Future syncInitFuture;
 
   /** Returns the singleton instance of SessionManager. */
   public static SessionManager getInstance() {
@@ -169,9 +167,4 @@ private void startOrStopCollectingGauges(ApplicationProcessState appState) {
   public void setPerfSession(PerfSession perfSession) {
     this.perfSession = perfSession;
   }
-
-  @VisibleForTesting
-  public Future getSyncInitFuture() {
-    return this.syncInitFuture;
-  }
 }

firebase-perf/src/test/java/com/google/firebase/perf/session/SessionManagerTest.java

@@ -78,7 +78,6 @@ public void setApplicationContext_initializeGaugeMetadataManager()
         new SessionManager(mockGaugeManager, mockPerfSession, mockAppStateMonitor);
     testSessionManager.setApplicationContext(mockApplicationContext);
 
-    testSessionManager.getSyncInitFuture().get();
     inOrder.verify(mockGaugeManager).initializeGaugeMetadataManager(any());
   }