Fix BlazorWebView disposal on Android (#7349)

Author: MackinnonBuck

src/BlazorWebView/src/Maui/Android/AndroidWebKitWebViewManager.cs

@@ -27,7 +27,6 @@ internal class AndroidWebKitWebViewManager : WebViewManager
 		private static readonly AUri AndroidAppOriginUri = AUri.Parse(AppOrigin)!;
 		private readonly AWebView _webview;
 		private readonly string _contentRootRelativeToAppRoot;
-		private WebMessagePort[]? _nativeToJSPorts;
 
 		/// <summary>
 		/// Constructs an instance of <see cref="AndroidWebKitWebViewManager"/>.
@@ -74,33 +73,21 @@ internal bool TryGetResponseContentInternal(string uri, bool allowFallbackOnHost
 
 		internal void SetUpMessageChannel()
 		{
-			_nativeToJSPorts = _webview.CreateWebMessageChannel();
+			// These ports will be closed automatically when the webview gets disposed.
+			var nativeToJSPorts = _webview.CreateWebMessageChannel();
 
 			var nativeToJs = new BlazorWebMessageCallback(message =>
 			{
 				MessageReceived(AppOriginUri, message!);
 			});
 
-			var destPort = new[] { _nativeToJSPorts[1] };
+			var destPort = new[] { nativeToJSPorts[1] };
 
-			_nativeToJSPorts[0].SetWebMessageCallback(nativeToJs);
+			nativeToJSPorts[0].SetWebMessageCallback(nativeToJs);
 
 			_webview.PostWebMessage(new WebMessage("capturePort", destPort), AndroidAppOriginUri);
 		}
 
-		protected override async ValueTask DisposeAsyncCore()
-		{
-			await base.DisposeAsyncCore();
-
-			if (_nativeToJSPorts is not null)
-			{
-				foreach (var port in _nativeToJSPorts)
-				{
-					port?.Close();
-				}
-			}
-		}
-
 		private class BlazorWebMessageCallback : WebMessagePort.WebMessageCallback
 		{
 			private readonly Action<string?> _onMessageReceived;