[in_app_purchase] Migrate `ThemeData.errorColor` (#6310)

* Migrate ThemeData.errorColor

* x

packages/in_app_purchase/in_app_purchase/example/lib/main.dart

diff --git a/packages/in_app_purchase/in_app_purchase/example/lib/main.dart b/packages/in_app_purchase/in_app_purchase/example/lib/main.dart
index 98a24d1..9e53b4b 100644
--- a/packages/in_app_purchase/in_app_purchase/example/lib/main.dart
+++ b/packages/in_app_purchase/in_app_purchase/example/lib/main.dart
@@ -4,12 +4,14 @@
 
 import 'dart:async';
 import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:in_app_purchase/in_app_purchase.dart';
 import 'package:in_app_purchase_android/billing_client_wrappers.dart';
 import 'package:in_app_purchase_android/in_app_purchase_android.dart';
 import 'package:in_app_purchase_storekit/in_app_purchase_storekit.dart';
 import 'package:in_app_purchase_storekit/store_kit_wrappers.dart';
+
 import 'consumable_store.dart';
 
 void main() {
@@ -194,7 +196,9 @@
     }
     final Widget storeHeader = ListTile(
       leading: Icon(_isAvailable ? Icons.check : Icons.block,
-          color: _isAvailable ? Colors.green : ThemeData.light().errorColor),
+          color: _isAvailable
+              ? Colors.green
+              : ThemeData.light().colorScheme.error),
       title:
           Text('The store is ${_isAvailable ? 'available' : 'unavailable'}.'),
     );
@@ -205,7 +209,7 @@
         const Divider(),
         ListTile(
           title: Text('Not connected',
-              style: TextStyle(color: ThemeData.light().errorColor)),
+              style: TextStyle(color: ThemeData.light().colorScheme.error)),
           subtitle: const Text(
               'Unable to connect to the payments processor. Has this app been configured correctly? See the example README for instructions.'),
         ),
@@ -229,7 +233,7 @@
     if (_notFoundIds.isNotEmpty) {
       productList.add(ListTile(
           title: Text('[${_notFoundIds.join(", ")}] not found',
-              style: TextStyle(color: ThemeData.light().errorColor)),
+              style: TextStyle(color: ThemeData.light().colorScheme.error)),
           subtitle: const Text(
               'This app needs special configuration to run. Please see example/README.md for instructions.')));
     }

packages/in_app_purchase/in_app_purchase_android/example/lib/main.dart

diff --git a/packages/in_app_purchase/in_app_purchase_android/example/lib/main.dart b/packages/in_app_purchase/in_app_purchase_android/example/lib/main.dart
index 6c0d967..4eea725 100644
--- a/packages/in_app_purchase/in_app_purchase_android/example/lib/main.dart
+++ b/packages/in_app_purchase/in_app_purchase_android/example/lib/main.dart
@@ -186,7 +186,9 @@
     }
     final Widget storeHeader = ListTile(
       leading: Icon(_isAvailable ? Icons.check : Icons.block,
-          color: _isAvailable ? Colors.green : ThemeData.light().errorColor),
+          color: _isAvailable
+              ? Colors.green
+              : ThemeData.light().colorScheme.error),
       title:
           Text('The store is ${_isAvailable ? 'available' : 'unavailable'}.'),
     );
@@ -197,7 +199,7 @@
         const Divider(),
         ListTile(
           title: Text('Not connected',
-              style: TextStyle(color: ThemeData.light().errorColor)),
+              style: TextStyle(color: ThemeData.light().colorScheme.error)),
           subtitle: const Text(
               'Unable to connect to the payments processor. Has this app been configured correctly? See the example README for instructions.'),
         ),
@@ -221,7 +223,7 @@
     if (_notFoundIds.isNotEmpty) {
       productList.add(ListTile(
           title: Text('[${_notFoundIds.join(", ")}] not found',
-              style: TextStyle(color: ThemeData.light().errorColor)),
+              style: TextStyle(color: ThemeData.light().colorScheme.error)),
           subtitle: const Text(
               'This app needs special configuration to run. Please see example/README.md for instructions.')));
     }

packages/in_app_purchase/in_app_purchase_storekit/example/lib/main.dart

diff --git a/packages/in_app_purchase/in_app_purchase_storekit/example/lib/main.dart b/packages/in_app_purchase/in_app_purchase_storekit/example/lib/main.dart
index a4f9b26..72086ee 100644
--- a/packages/in_app_purchase/in_app_purchase_storekit/example/lib/main.dart
+++ b/packages/in_app_purchase/in_app_purchase_storekit/example/lib/main.dart
@@ -188,7 +188,9 @@
     }
     final Widget storeHeader = ListTile(
       leading: Icon(_isAvailable ? Icons.check : Icons.block,
-          color: _isAvailable ? Colors.green : ThemeData.light().errorColor),
+          color: _isAvailable
+              ? Colors.green
+              : ThemeData.light().colorScheme.error),
       title:
           Text('The store is ${_isAvailable ? 'available' : 'unavailable'}.'),
     );
@@ -199,7 +201,7 @@
         const Divider(),
         ListTile(
           title: Text('Not connected',
-              style: TextStyle(color: ThemeData.light().errorColor)),
+              style: TextStyle(color: ThemeData.light().colorScheme.error)),
           subtitle: const Text(
               'Unable to connect to the payments processor. Has this app been configured correctly? See the example README for instructions.'),
         ),
@@ -223,7 +225,7 @@
     if (_notFoundIds.isNotEmpty) {
       productList.add(ListTile(
           title: Text('[${_notFoundIds.join(", ")}] not found',
-              style: TextStyle(color: ThemeData.light().errorColor)),
+              style: TextStyle(color: ThemeData.light().colorScheme.error)),
           subtitle: const Text(
               'This app needs special configuration to run. Please see example/README.md for instructions.')));
     }