Revert "Refactors global key duplication detection (#46183)" (#49847)

This reverts commit 340b193f.

packages/flutter/lib/src/cupertino/action_sheet.dart

@@ -469,7 +469,6 @@ class _CupertinoAlertRenderElement extends RenderObjectElement {
     } else if (_actionsElement == child) {
       _actionsElement = null;
     }
-    super.forgetChild(child);
   }
 
   @override

packages/flutter/lib/src/cupertino/dialog.dart

@@ -464,7 +464,6 @@ class _CupertinoDialogRenderElement extends RenderObjectElement {
       assert(_actionsElement == child);
       _actionsElement = null;
     }
-    super.forgetChild(child);
   }
 
   @override

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

@@ -2072,7 +2072,6 @@ class _RenderChipElement extends RenderObjectElement {
     final _ChipSlot slot = childToSlot[child];
     childToSlot.remove(child);
     slotToChild.remove(slot);
-    super.forgetChild(child);
   }
 
   void _mountChild(Widget widget, _ChipSlot slot) {

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

@@ -1511,7 +1511,6 @@ class _RenderDecorationElement extends RenderObjectElement {
     final _DecorationSlot slot = childToSlot[child];
     childToSlot.remove(child);
     slotToChild.remove(slot);
-    super.forgetChild(child);
   }
 
   void _mountChild(Widget widget, _DecorationSlot slot) {

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

@@ -992,7 +992,6 @@ class _ListTileElement extends RenderObjectElement {
     final _ListTileSlot slot = childToSlot[child];
     childToSlot.remove(child);
     slotToChild.remove(slot);
-    super.forgetChild(child);
   }
 
   void _mountChild(Widget widget, _ListTileSlot slot) {

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

@@ -1016,7 +1016,6 @@ class RenderObjectToWidgetElement<T extends RenderObject> extends RootRenderObje
   void forgetChild(Element child) {
     assert(child == _child);
     _child = null;
-    super.forgetChild(child);
   }
 
   @override

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

@@ -60,7 +60,6 @@ class _LayoutBuilderElement<ConstraintType extends Constraints> extends RenderOb
   void forgetChild(Element child) {
     assert(child == _child);
     _child = null;
-    super.forgetChild(child);
   }
 
   @override

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

@@ -924,7 +924,6 @@ class ListWheelElement extends RenderObjectElement implements ListWheelChildMana
   @override
   void forgetChild(Element child) {
     _childElements.remove(child.slot);
-    super.forgetChild(child);
   }
 
 }

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

@@ -1160,7 +1160,6 @@ class SliverMultiBoxAdaptorElement extends RenderObjectElement implements Render
     assert(child.slot != null);
     assert(_childElements.containsKey(child.slot));
     _childElements.remove(child.slot);
-    super.forgetChild(child);
   }
 
   @override

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

@@ -230,7 +230,6 @@ class _SliverPersistentHeaderElement extends RenderObjectElement {
   void forgetChild(Element child) {
     assert(child == this.child);
     this.child = null;
-    super.forgetChild(child);
   }
 
   @override

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

@@ -344,7 +344,6 @@ class _TableElement extends RenderObjectElement {
   @override
   bool forgetChild(Element child) {
     _forgottenChildren.add(child);
-    super.forgetChild(child);
     return true;
   }
 }

packages/flutter/test/foundation/diagnostics_json_test.dart

@@ -221,6 +221,11 @@ void main() {
 class _TestElement extends Element {
   _TestElement() : super(const Placeholder());
 
+  @override
+  void forgetChild(Element child) {
+    // Intentionally left empty.
+  }
+
   @override
   void performRebuild() {
     // Intentionally left empty.