Remove conditional import

lib/widgets/editor.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'dart:io' as io;
 import 'dart:math' as math;
+import 'dart:ui' as ui;
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
@@ -24,7 +25,6 @@ import 'package:string_validator/string_validator.dart';
 import 'package:universal_html/prefer_universal/html.dart' as html;
 import 'package:url_launcher/url_launcher.dart';
 
-import 'fake_ui.dart' if (dart.library.html) 'real_ui.dart' as ui;
 import 'box.dart';
 import 'controller.dart';
 import 'cursor.dart';

lib/widgets/fake_ui.dart

@@ -1,4 +0,0 @@
-// ignore: camel_case_types
-class platformViewRegistry {
-  static registerViewFactory(String viewId, dynamic cb) {}
-}

lib/widgets/real_ui.dart

@@ -1,9 +0,0 @@
-import 'dart:ui' as ui;
-
-// ignore: camel_case_types
-class platformViewRegistry {
-  static registerViewFactory(String viewId, dynamic cb) {
-    // ignore:undefined_prefixed_name
-    ui.platformViewRegistry.registerViewFactory(viewId, cb);
-  }
-}