Move updateProfile from FirebaseAuth to FirebaseUser. Minor cleanup in Java.

Author: slightfoot

packages/firebase_auth/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java

@@ -136,6 +136,7 @@ public void onMethodCall(MethodCall call, Result result) {
   }
 
   private void handleSignInWithPhoneNumber(MethodCall call, Result result) {
+    @SuppressWarnings("unchecked")
     Map<String, String> arguments = (Map<String, String>) call.arguments;
     String verificationId = arguments.get("verificationId");
     String smsCode = arguments.get("smsCode");
@@ -447,18 +448,7 @@ private void handleUpdateProfile(MethodCall call, final Result result) {
     firebaseAuth
         .getCurrentUser()
         .updateProfile(builder.build())
-        .addOnCompleteListener(
-            new OnCompleteListener<Void>() {
-              @Override
-              public void onComplete(@NonNull Task<Void> task) {
-                if (!task.isSuccessful()) {
-                  Exception e = task.getException();
-                  result.error(ERROR_REASON_EXCEPTION, e.getMessage(), null);
-                } else {
-                  result.success(null);
-                }
-              }
-            });
+        .addOnCompleteListener(new TaskVoidCompleteListener(result));
   }
 
   private void handleStartListeningAuthState(MethodCall call, final Result result) {

packages/firebase_auth/lib/firebase_auth.dart

@@ -108,6 +108,15 @@ class FirebaseUser extends UserInfo {
     );
   }
 
+  /// Updates the user profile information.
+  Future<void> updateProfile(UserUpdateInfo userUpdateInfo) async {
+    assert(userUpdateInfo != null);
+    return await FirebaseAuth.channel.invokeMethod(
+      'updateProfile',
+      userUpdateInfo._updateData,
+    );
+  }
+
   @override
   String toString() {
     return '$runtimeType($_data)';
@@ -382,14 +391,6 @@ class FirebaseAuth {
     return currentUser;
   }
 
-  Future<void> updateProfile(UserUpdateInfo userUpdateInfo) async {
-    assert(userUpdateInfo != null);
-    return await channel.invokeMethod(
-      'updateProfile',
-      userUpdateInfo._updateData,
-    );
-  }
-
   /// Links google account with current user and returns [Future<FirebaseUser>]
   ///
   /// throws [PlatformException] when