Reopening #42455 Chip delete button tap target is too small.

Steps to Reproduce

1. Add androidTapTargetGuideline test case to packages/flutter/test/material/chip_test.dart. See code below.

     testWidgets('delete button tap target complies with minimum tap target guideline', (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
       final UniqueKey deleteKey = UniqueKey();
       await tester.pumpWidget(
         _wrapForChip(
           child: Column(
             children: <Widget>[
               Chip(
                 label: const Text('Label'),
                 deleteIcon: Icon(Icons.delete, key: deleteKey),
                 onDeleted: () { },
               ),
             ],
           ),
         ),
       );
   
       await expectLater(tester, meetsGuideline(androidTapTargetGuideline));
   
       handle.dispose();
     });

2. Execute cd packages/flutter and flutter test flutter/test/material/chip_test.dart

Expected results:

• All tests pass

Actual results:

• delete button tap target complies with minimum tap target guideline [E] fails with

  Expected: Tappable objects should be at least Size(48.0, 48.0)
  Actual: <Instance of 'WidgetTester'>
  Which: SemanticsNode#5(Rect.fromLTRB(90.0, 12.0, 114.0, 36.0), actions: [tap], flags: [isButton,
  isFocusable], label: "Delete", textDirection: ltr): expected tap target size of at least Size(48.0,
  48.0), but found Size(24.0, 24.0)
          See also: https://support.google.com/accessibility/android/answer/7101858?hl=en
  

[✓] Flutter (Channel unknown, 2.6.0-12.0.pre.805, on Debian GNU/Linux rodete 5.10.46-5rodete1-amd64, locale en_US.utf8)
    • Flutter version 2.6.0-12.0.pre.805 at /usr/local/google/home/abalov/flutter
    • Upstream repository unknown
    • Framework revision aee9ade8e3 (60 minutes ago), 2021-11-23 04:03:03 -0500
    • Engine revision f4cb61cefc
    • Dart version 2.16.0 (build 2.16.0-36.0.dev)
    • DevTools version 2.8.0