feat(firebase_analytics): restrict logInAppPurchase to iOS

Author: SelaseKay

packages/firebase_analytics/firebase_analytics/lib/firebase_analytics.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:io';
+
 import 'package:firebase_analytics_platform_interface/firebase_analytics_platform_interface.dart';
 import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_core_platform_interface/firebase_core_platform_interface.dart'

packages/firebase_analytics/firebase_analytics/lib/src/firebase_analytics.dart

@@ -1223,6 +1223,9 @@ class FirebaseAnalytics extends FirebasePluginPlatform {
     bool? subscription,
     num? value,
   }) {
+    if (!Platform.isIOS) {
+      throw UnimplementedError('logInAppPurchase() is only supported on iOS.');
+    }
     return _delegate.logEvent(
       name: 'in_app_purchase',
       parameters: filterOutNulls(<String, Object?>{

packages/firebase_analytics/firebase_analytics_web/lib/firebase_analytics_web.dart

@@ -70,9 +70,6 @@ class FirebaseAnalyticsWeb extends FirebaseAnalyticsPlatform {
     Map<String, Object?>? parameters,
     AnalyticsCallOptions? callOptions,
   }) async {
-    if (name == 'in_app_purchase') {
-      throw UnimplementedError('in_app_purchase() is not supported on Web.');
-    }
     return convertWebExceptions(() {
       return _delegate.logEvent(
         name: name,