Fix duplicated TestInspectorController

Author: elliette

packages/devtools_test/lib/src/mocks/mocks.dart

@@ -64,22 +64,6 @@ class FakeInspectorService extends Fake implements InspectorService {
   bool get hoverEvalModeEnabledByDefault => true;
 }
 
-class TestInspectorController extends Fake implements InspectorController {
-  InspectorService service = FakeInspectorService();
-
-  @override
-  ValueListenable<InspectorTreeNode?> get selectedNode => _selectedNode;
-  final _selectedNode = ValueNotifier<InspectorTreeNode?>(null);
-
-  @override
-  void setSelectedNode(InspectorTreeNode? newSelection) {
-    _selectedNode.value = newSelection;
-  }
-
-  @override
-  InspectorService get inspectorService => service;
-}
-
 class TestInspectorController extends Fake implements InspectorController {
   InspectorService service = FakeInspectorService();