Step 3 of 3: Remove opt-in for debugCheckHasMaterialLocalizations assertion on TextField (#58831)

packages/flutter/lib/src/material/debug.dart

@@ -78,8 +78,8 @@ bool debugCheckHasMaterialLocalizations(BuildContext context) {
           'to be provided by a Localizations widget ancestor.'
         ),
         ErrorDescription(
-          'Localizations are used to generate many different messages, labels, '
-          'and abbreviations which are used by the material library.'
+          'The material library uses Localizations to generate messages, '
+          'labels, and abbreviations.'
         ),
         ErrorHint(
           'To introduce a MaterialLocalizations, either use a '

packages/flutter/lib/src/material/text_field.dart

@@ -4,10 +4,6 @@
 
 // @dart = 2.8
 
-// TODO(Piinks): Remove ignoring deprecated member use analysis
-// when TextField.canAssertMaterialLocalizations parameter is removed.
-// ignore_for_file: deprecated_member_use_from_same_package
-
 import 'dart:ui' as ui show BoxHeightStyle, BoxWidthStyle;
 
 import 'package:flutter/cupertino.dart';
@@ -354,7 +350,6 @@ class TextField extends StatefulWidget {
     this.scrollController,
     this.scrollPhysics,
     this.autofillHints,
-    bool canAssertMaterialLocalizations,
   }) : assert(textAlign != null),
        assert(readOnly != null),
        assert(autofocus != null),
@@ -400,7 +395,6 @@ class TextField extends StatefulWidget {
            selectAll: true,
            paste: true,
          )),
-       canAssertMaterialLocalizations = canAssertMaterialLocalizations ?? true,
        super(key: key);
 
   /// Controls the text being edited.
@@ -733,16 +727,6 @@ class TextField extends StatefulWidget {
   /// {@macro flutter.services.autofill.autofillHints}
   final Iterable<String> autofillHints;
 
-  /// Indicates whether [debugCheckHasMaterialLocalizations] can be called
-  /// during build.
-  @Deprecated(
-    'Set canAssertMaterialLocalizations to `true`. This parameter will be '
-    'removed and was introduced to migrate TextField to assert '
-    'debugCheckHasMaterialLocalizations by default. '
-    'This feature was deprecated after v1.18.0.'
-  )
-  final bool canAssertMaterialLocalizations;
-
   @override
   _TextFieldState createState() => _TextFieldState();
 
@@ -1004,8 +988,7 @@ class _TextFieldState extends State<TextField> implements TextSelectionGestureDe
   @override
   Widget build(BuildContext context) {
     assert(debugCheckHasMaterial(context));
-    if (widget.canAssertMaterialLocalizations)
-      assert(debugCheckHasMaterialLocalizations(context));
+    assert(debugCheckHasMaterialLocalizations(context));
     assert(debugCheckHasDirectionality(context));
     assert(
       !(widget.style != null && widget.style.inherit == false &&

packages/flutter/test/material/debug_test.dart

@@ -69,8 +69,8 @@ void main() {
       '   No MaterialLocalizations found.\n'
       '   BackButton widgets require MaterialLocalizations to be provided\n'
       '   by a Localizations widget ancestor.\n'
-      '   Localizations are used to generate many different messages,\n'
-      '   labels, and abbreviations which are used by the material library.\n'
+      '   The material library uses Localizations to generate messages,\n'
+      '   labels, and abbreviations.\n'
       '   To introduce a MaterialLocalizations, either use a MaterialApp at\n'
       '   the root of your application to include them automatically, or\n'
       '   add a Localization widget with a MaterialLocalizations delegate.\n'