Fixed build of example code to use new binary messenger API. (#35825)

Fixed build of example code to use new binary messenger API.

dev/bots/test.dart

diff --git a/dev/bots/test.dart b/dev/bots/test.dart
index fc739f1..7818b77 100644
--- a/dev/bots/test.dart
+++ b/dev/bots/test.dart
@@ -272,12 +272,10 @@
       continue;
     }
     final String examplePath = fileEntity.path;
-    final String basename = path.basename(examplePath);
-    final bool expectIpaBuildFailure = basename == 'platform_channel_swift'; // Remove when https://github.com/flutter/flutter/issues/35773 is fixed.
 
     await _flutterBuildAot(examplePath);
     await _flutterBuildApk(examplePath);
-    await _flutterBuildIpa(examplePath, expectIpaBuildFailure: expectIpaBuildFailure);
+    await _flutterBuildIpa(examplePath);
   }
   await _flutterBuildDart2js(path.join('dev', 'integration_tests', 'web'));
 
@@ -322,7 +320,7 @@
   print('Done.');
 }
 
-Future<void> _flutterBuildIpa(String relativePathToApplication, {bool expectIpaBuildFailure = false}) async {
+Future<void> _flutterBuildIpa(String relativePathToApplication) async {
   if (!Platform.isMacOS) {
     return;
   }
@@ -341,7 +339,7 @@
   await runCommand(flutter,
     <String>['build', 'ios', '--no-codesign', '--debug', '-v'],
     workingDirectory: path.join(flutterRoot, relativePathToApplication),
-    expectNonZeroExit: expectIpaBuildFailure,
+    expectNonZeroExit: false,
     timeout: _kShortTimeout,
   );
   print('Done.');

examples/platform_channel_swift/ios/Runner/AppDelegate.swift

diff --git a/examples/platform_channel_swift/ios/Runner/AppDelegate.swift b/examples/platform_channel_swift/ios/Runner/AppDelegate.swift
index 04ca367..937c819 100644
--- a/examples/platform_channel_swift/ios/Runner/AppDelegate.swift
+++ b/examples/platform_channel_swift/ios/Runner/AppDelegate.swift
@@ -31,7 +31,7 @@
       fatalError("rootViewController is not type FlutterViewController")
     }
     let batteryChannel = FlutterMethodChannel(name: ChannelName.battery,
-                                              binaryMessenger: controller)
+                                              binaryMessenger: controller.binaryMessenger)
     batteryChannel.setMethodCallHandler({
       [weak self] (call: FlutterMethodCall, result: FlutterResult) -> Void in
       guard call.method == "getBatteryLevel" else {
@@ -42,7 +42,7 @@
     })
 
     let chargingChannel = FlutterEventChannel(name: ChannelName.charging,
-                                              binaryMessenger: controller)
+                                              binaryMessenger: controller.binaryMessenger)
     chargingChannel.setStreamHandler(self)
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }