Reverts "[web] fix text selection offset in multi-line fields (#166565)" (#166644)

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Reverts: flutter/flutter#166565
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<!-- start_initiating_author -->
Initiated by: jtmcdole
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<!-- start_revert_reason -->
Reason for reverting: Tree is broken
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20linux_web_engine_tests/1240/overview
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<!-- start_original_pr_author -->
Original PR Author: yjbanov
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<!-- start_reviewers -->
Reviewed By: {justinmc}
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<!-- start_revert_body -->
This change reverts the following previous change:
Fixes https://github.com/flutter/flutter/issues/162698
<!-- end_revert_body -->

Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>

engine/src/flutter/lib/web_ui/lib/src/engine/dom.dart

@@ -543,7 +543,6 @@ extension type DomCSSStyleDeclaration._(JSObject _) implements JSObject {
   set textAlign(String value) => setProperty('text-align', value);
   set font(String value) => setProperty('font', value);
   set cursor(String value) => setProperty('cursor', value);
-  set scrollbarWidth(String value) => setProperty('scrollbar-width', value);
   String get width => getPropertyValue('width');
   String get height => getPropertyValue('height');
   String get position => getPropertyValue('position');
@@ -605,7 +604,6 @@ extension type DomCSSStyleDeclaration._(JSObject _) implements JSObject {
   String get textAlign => getPropertyValue('text-align');
   String get font => getPropertyValue('font');
   String get cursor => getPropertyValue('cursor');
-  String get scrollbarWidth => getPropertyValue('scrollbar-width');
 
   external String getPropertyValue(String property);
 

engine/src/flutter/lib/web_ui/lib/src/engine/semantics/text_field.dart

@@ -6,7 +6,6 @@ import 'package:ui/ui.dart' as ui;
 
 import '../dom.dart';
 import '../platform_dispatcher.dart';
-import '../text_editing/input_type.dart';
 import '../text_editing/text_editing.dart';
 import 'semantics.dart';
 
@@ -230,7 +229,7 @@ class SemanticTextField extends SemanticRole {
   }
 
   DomHTMLTextAreaElement _createMultiLineField() {
-    final textArea = createMultilineTextArea();
+    final textArea = createDomHTMLTextAreaElement();
 
     if (semanticsObject.hasFlag(ui.SemanticsFlag.isObscured)) {
       // -webkit-text-security is not standard, but it's the best we can do.

engine/src/flutter/lib/web_ui/lib/src/engine/text_editing/input_type.dart

@@ -120,7 +120,7 @@ class MultilineNoTextInputType extends MultilineInputType {
   String? get inputmodeAttribute => 'none';
 
   @override
-  DomHTMLElement createDomElement() => createMultilineTextArea();
+  DomHTMLElement createDomElement() => createDomHTMLTextAreaElement();
 }
 
 /// Single-line text input type.
@@ -184,12 +184,5 @@ class MultilineInputType extends EngineInputType {
   String? get inputmodeAttribute => null;
 
   @override
-  DomHTMLElement createDomElement() => createMultilineTextArea();
-}
-
-DomHTMLTextAreaElement createMultilineTextArea() {
-  final element = createDomHTMLTextAreaElement();
-  // Scrollbar width affects text layout. This zeroes out the scrollbar width.
-  element.style.scrollbarWidth = 'none';
-  return element;
+  DomHTMLElement createDomElement() => createDomHTMLTextAreaElement();
 }

engine/src/flutter/lib/web_ui/lib/src/engine/text_editing/text_editing.dart

@@ -64,6 +64,7 @@ void _setStaticStyleAttributes(DomHTMLElement domElement) {
     // For more details, see: https://developer.mozilla.org/en-US/docs/Web/CSS/forced-color-adjust
     ..setProperty('forced-color-adjust', 'none')
     ..whiteSpace = 'pre-wrap'
+    ..alignContent = 'center'
     ..position = 'absolute'
     ..top = '0'
     ..left = '0'
@@ -107,6 +108,7 @@ void _styleAutofillElements(
   final DomCSSStyleDeclaration elementStyle = domElement.style;
   elementStyle
     ..whiteSpace = 'pre-wrap'
+    ..alignContent = 'center'
     ..padding = '0'
     ..opacity = '1'
     ..color = 'transparent'

engine/src/flutter/lib/web_ui/test/engine/text_editing_test.dart

@@ -840,45 +840,6 @@ Future<void> testMain() async {
       expect(spy.messages, isEmpty);
     });
 
-    test('Does not align content in autofill group elements', () {
-      final setClient = MethodCall('TextInput.setClient', <dynamic>[
-        123,
-        createFlutterConfig('text'),
-      ]);
-      sendFrameworkMessage(codec.encodeMethodCall(setClient));
-
-      const setEditingState = MethodCall('TextInput.setEditingState', <String, dynamic>{
-        'text': 'abcd',
-        'selectionBase': 2,
-        'selectionExtent': 3,
-      });
-      sendFrameworkMessage(codec.encodeMethodCall(setEditingState));
-
-      const show = MethodCall('TextInput.show');
-      sendFrameworkMessage(codec.encodeMethodCall(show));
-
-      // Form elements
-      {
-        final formElement = textEditing!.configuration!.autofillGroup!.formElement;
-        expect(formElement.style.alignContent, isEmpty);
-
-        // Should contain one <input type="text"> and one <input type="submit">
-        expect(formElement.children, hasLength(2));
-
-        final inputElement = formElement.children.first;
-        expect(inputElement.style.alignContent, isEmpty);
-
-        final submitElement = formElement.children.last;
-        expect(submitElement.style.alignContent, isEmpty);
-      }
-
-      // Active element
-      {
-        final DomHTMLElement activeElement = textEditing!.strategy.activeDomElement;
-        expect(activeElement.style.alignContent, isEmpty);
-      }
-    });
-
     test('focus and connection with blur', () async {
       // In all the desktop browsers we are keeping the connection
       // open, keep the text editing element focused if it receives a blur
@@ -3624,10 +3585,6 @@ Future<void> testMain() async {
       // though it supports forced-colors. Safari doesn't support forced-colors
       // so this isn't a problem there.
     }, skip: isFirefox || isSafari);
-
-    test('Multi-line text area scrollbars are zero-width', () {
-      expect(createMultilineTextArea().style.scrollbarWidth, 'none');
-    });
   });
 }