remove old lifecycle bug workaround for web

@@ -11,8 +11,7 @@ export 'src/enums/phone_type.dart';
 export 'src/enums/torch_state.dart';
 export 'src/mobile_scanner.dart';
 export 'src/mobile_scanner_controller.dart';
-export 'src/mobile_scanner_exception.dart'
-    hide PermissionRequestPendingException;
+export 'src/mobile_scanner_exception.dart';
 export 'src/mobile_scanner_platform_interface.dart';
 export 'src/objects/address.dart';
 export 'src/objects/barcode.dart';

@@ -246,13 +246,6 @@ class MobileScannerController extends ValueNotifier<MobileScannerState> {
       );
     }
 
-    // Permission was denied, do nothing.
-    // When the controller is stopped,
-    // the error is reset so the permission can be requested again if possible.
-    if (value.error?.errorCode == MobileScannerErrorCode.permissionDenied) {
-      return;
-    }
-
     // Do nothing if the camera is already running.
     if (value.isRunning) {
       return;
@@ -306,8 +299,6 @@ class MobileScannerController extends ValueNotifier<MobileScannerState> {
           zoomScale: 1.0,
         );
       }
-    } on PermissionRequestPendingException catch (_) {
-      // If a permission request was already pending, do nothing.
     }
   }
 

@@ -40,13 +40,6 @@ class MobileScannerErrorDetails {
   final String? message;
 }
 
-/// This class represents an exception that is thrown
-/// when the scanner was (re)started while a permission request was pending.
-///
-/// This exception type is only used internally,
-/// and is not part of the public API.
-class PermissionRequestPendingException implements Exception {}
-
 /// This class represents an exception thrown by the [MobileScannerController]
 /// when a barcode scanning error occurs when processing an input frame.
 class MobileScannerBarcodeException implements Exception {

@@ -39,12 +39,6 @@ class MobileScannerWeb extends MobileScannerPlatform {
   /// The container div element for the camera view.
   late HTMLDivElement _divElement;
 
-  /// The flag that keeps track of whether a permission request is in progress.
-  ///
-  /// On the web, a permission request triggers a dialog, that in turn triggers a lifecycle change.
-  /// While the permission request is in progress, any attempts at (re)starting the camera should be ignored.
-  bool _permissionRequestInProgress = false;
-
   /// The stream controller for the media track settings stream.
   ///
   /// Currently, only the facing mode setting can be supported,
@@ -199,17 +193,12 @@ class MobileScannerWeb extends MobileScannerPlatform {
     }
 
     try {
-      _permissionRequestInProgress = true;
-
       // Retrieving the media devices requests the camera permission.
       final MediaStream videoStream =
           await window.navigator.mediaDevices.getUserMedia(constraints).toDart;
 
-      _permissionRequestInProgress = false;
-
       return videoStream;
     } on DOMException catch (error, stackTrace) {
-      _permissionRequestInProgress = false;
       final String errorMessage = error.toString();
 
       MobileScannerErrorCode errorCode = MobileScannerErrorCode.genericError;
@@ -272,20 +261,7 @@ class MobileScannerWeb extends MobileScannerPlatform {
 
   @override
   Future<MobileScannerViewAttributes> start(StartOptions startOptions) async {
-    // If the permission request has not yet completed,
-    // the camera view is not ready yet.
-    // Prevent the permission popup from triggering a restart of the scanner.
-    if (_permissionRequestInProgress) {
-      throw PermissionRequestPendingException();
-    }
-
-    _barcodeReader = ZXingBarcodeReader();
-
-    await _barcodeReader?.maybeLoadLibrary(
-      alternateScriptUrl: _alternateScriptUrl,
-    );
-
-    if (_barcodeReader?.isScanning ?? false) {
+    if (_barcodeReader != null) {
       throw const MobileScannerException(
         errorCode: MobileScannerErrorCode.controllerAlreadyInitialized,
         errorDetails: MobileScannerErrorDetails(
@@ -295,6 +271,12 @@ class MobileScannerWeb extends MobileScannerPlatform {
       );
     }
 
+    _barcodeReader = ZXingBarcodeReader();
+
+    await _barcodeReader?.maybeLoadLibrary(
+      alternateScriptUrl: _alternateScriptUrl,
+    );
+
     // Request camera permissions and prepare the video stream.
     final MediaStream videoStream = await _prepareVideoStream(
       startOptions.cameraDirection,