Address comments.

Author: visumickey

firebase-perf/src/main/java/com/google/firebase/perf/FirebasePerfRegistrar.java

@@ -48,7 +48,7 @@ public List<Component<?>> getComponents() {
             .add(Dependency.requiredProvider(RemoteConfigComponent.class))
             .add(Dependency.required(FirebaseInstallationsApi.class))
             .add(Dependency.requiredProvider(TransportFactory.class))
-            .factory(this::providesFirebasePerformance)
+            .factory(FirebasePerfRegistrar::providesFirebasePerformance)
             // Since the SDK is eager(auto starts at app start), we use "lazy" dependency for some
             // components that are not required during initialization so as not to force initialize
             // them at app startup (refer
@@ -58,7 +58,7 @@ public List<Component<?>> getComponents() {
         LibraryVersionComponent.create("fire-perf", BuildConfig.VERSION_NAME));
   }
 
-  public FirebasePerformance providesFirebasePerformance(ComponentContainer container) {
+  private static FirebasePerformance providesFirebasePerformance(ComponentContainer container) {
     FirebasePerformanceComponent component =
         DaggerFirebasePerformanceComponent.builder()
             .firebasePerformanceModule(

firebase-perf/src/main/java/com/google/firebase/perf/FirebasePerformance.java

@@ -133,10 +133,10 @@ public static FirebasePerformance getInstance() {
   // to false if it's been force disabled or it is set to null if neither.
   @Nullable private Boolean mPerformanceCollectionForceEnabledState = null;
 
-  FirebaseApp firebaseApp;
-  Provider<RemoteConfigComponent> firebaseRemoteConfigProvider;
-  FirebaseInstallationsApi firebaseInstallationsApi;
-  Provider<TransportFactory> transportFactoryProvider;
+  private FirebaseApp firebaseApp;
+  private Provider<RemoteConfigComponent> firebaseRemoteConfigProvider;
+  private FirebaseInstallationsApi firebaseInstallationsApi;
+  private Provider<TransportFactory> transportFactoryProvider;
 
   @Inject
   FirebasePerformance(

firebase-perf/src/main/java/com/google/firebase/perf/FirebasePerformanceModule.java

@@ -27,8 +27,8 @@
 public class FirebasePerformanceModule {
   private final FirebaseApp firebaseApp;
   private final FirebaseInstallationsApi firebaseInstallations;
-  private Provider<RemoteConfigComponent> remoteConfigComponentProvider;
-  private Provider<TransportFactory> transportFactoryProvider;
+  private final Provider<RemoteConfigComponent> remoteConfigComponentProvider;
+  private final Provider<TransportFactory> transportFactoryProvider;
 
   public FirebasePerformanceModule(
       @NonNull FirebaseApp firebaseApp,