remove ununsed deprecated field (#64076)

packages/flutter/lib/src/widgets/basic.dart

@@ -5214,13 +5214,6 @@ class RichText extends MultiChildRenderObjectWidget {
     this.strutStyle,
     this.textWidthBasis = TextWidthBasis.parent,
     this.textHeightBehavior,
-    @Deprecated(
-      'This parameter is a temporary flag to migrate the internal tests and '
-      'should not be used in other contexts. For more details, see '
-      'https://github.com/flutter/flutter/issues/59316. '
-      'This feature was deprecated after v1.19.0.'
-    )
-    bool applyTextScaleFactorToWidgetSpan = false,
   }) : assert(text != null),
        assert(textAlign != null),
        assert(softWrap != null),

packages/flutter/lib/src/widgets/text.dart

@@ -388,13 +388,6 @@ class Text extends StatelessWidget {
     this.semanticsLabel,
     this.textWidthBasis,
     this.textHeightBehavior,
-    @Deprecated(
-      'This parameter is a temporary flag to migrate the internal tests and '
-      'should not be used in other contexts. For more details, please check '
-      'https://github.com/flutter/flutter/issues/59316. '
-      'This feature was deprecated after v1.19.0.'
-    )
-    bool applyTextScaleFactorToWidgetSpan = false,
   }) : assert(
          textSpan != null,
          'A non-null TextSpan must be provided to a Text.rich widget.',