Delete unused wasmByDefault feature flag (#9576)

Author: elliette

packages/devtools_app/lib/src/shared/feature_flags.dart

@@ -101,16 +101,6 @@ extension FeatureFlags on Never {
     enabled: true,
   );
 
-  /// Flag to enable refactors in the Flutter Property Editor sidebar.
-  ///
-  /// https://github.com/flutter/devtools/issues/9214
-  static const wasmByDefault = FlutterChannelFeatureFlag(
-    name: 'wasmByDefault',
-    flutterChannel: FlutterChannel.beta,
-    enabledForDartApps: false,
-    enabledForFlutterAppsFallback: false,
-  );
-
   /// A set of all the boolean feature flags for debugging purposes.
   ///
   /// When adding a new boolean flag, you are responsible for adding it to this
@@ -129,9 +119,7 @@ extension FeatureFlags on Never {
   ///
   /// When adding a new Flutter channel flag, you are responsible for adding it
   /// to this map as well.
-  static final _flutterChannelFlags = <FlutterChannelFeatureFlag>{
-    wasmByDefault,
-  };
+  static final _flutterChannelFlags = <FlutterChannelFeatureFlag>{};
 
   /// A helper to print the status of all the feature flags.
   static void debugPrintFeatureFlags({ConnectedApp? connectedApp}) {