Revert "Fix `DropdownButton` menu clip" (#104203)

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

@@ -286,30 +286,27 @@ class _DropdownMenuState<T> extends State<_DropdownMenu<T>> {
           namesRoute: true,
           explicitChildNodes: true,
           label: localizations.popupMenuLabel,
-          child: ClipRRect(
-            borderRadius: widget.borderRadius ?? BorderRadius.zero,
-            child: Material(
-              type: MaterialType.transparency,
-              textStyle: route.style,
-              child: ScrollConfiguration(
-                // Dropdown menus should never overscroll or display an overscroll indicator.
-                // Scrollbars are built-in below.
-                // Platform must use Theme and ScrollPhysics must be Clamping.
-                behavior: ScrollConfiguration.of(context).copyWith(
-                  scrollbars: false,
-                  overscroll: false,
-                  physics: const ClampingScrollPhysics(),
-                  platform: Theme.of(context).platform,
-                ),
-                child: PrimaryScrollController(
-                  controller: widget.route.scrollController!,
-                  child: Scrollbar(
-                    thumbVisibility: true,
-                    child: ListView(
-                      padding: kMaterialListPadding,
-                      shrinkWrap: true,
-                      children: children,
-                    ),
+          child: Material(
+            type: MaterialType.transparency,
+            textStyle: route.style,
+            child: ScrollConfiguration(
+              // Dropdown menus should never overscroll or display an overscroll indicator.
+              // Scrollbars are built-in below.
+              // Platform must use Theme and ScrollPhysics must be Clamping.
+              behavior: ScrollConfiguration.of(context).copyWith(
+                scrollbars: false,
+                overscroll: false,
+                physics: const ClampingScrollPhysics(),
+                platform: Theme.of(context).platform,
+              ),
+              child: PrimaryScrollController(
+                controller: widget.route.scrollController!,
+                child: Scrollbar(
+                  thumbVisibility: true,
+                  child: ListView(
+                    padding: kMaterialListPadding,
+                    shrinkWrap: true,
+                    children: children,
                   ),
                 ),
               ),

packages/flutter/test/material/dropdown_test.dart

@@ -3839,35 +3839,4 @@ void main() {
     expect(tester.getBottomRight(find.text(hintText)).dx, 776.0);
     expect(tester.getBottomRight(find.text(hintText)).dy, 350.0);
   });
-
-  testWidgets('BorderRadius property clips dropdown menu', (WidgetTester tester) async {
-    const double radius = 20.0;
-
-    await tester.pumpWidget(
-      MaterialApp(
-        home: Scaffold(
-          body: Center(
-            child: DropdownButtonFormField<String>(
-              borderRadius: BorderRadius.circular(radius),
-              value: 'One',
-              items: <String>['One', 'Two', 'Three', 'Four']
-                .map<DropdownMenuItem<String>>((String value) {
-                  return DropdownMenuItem<String>(
-                    value: value,
-                    child: Text(value),
-                  );
-              }).toList(),
-              onChanged: (_) { },
-            ),
-          ),
-        ),
-      ),
-    );
-
-    await tester.tap(find.text('One'));
-    await tester.pumpAndSettle();
-
-    final RenderClipRRect renderClip = tester.allRenderObjects.whereType<RenderClipRRect>().first;
-    expect(renderClip.borderRadius, BorderRadius.circular(radius));
-  });
 }