Remove deprecated PlatformViewsService.synchronizeToNativeViewHierarchy (#133175)

Part of https://github.com/flutter/flutter/issues/133171

packages/flutter/lib/src/services/platform_views.dart

@@ -196,13 +196,6 @@ class PlatformViewsService {
     return controller;
   }
 
-  /// Whether the render surface of the Android `FlutterView` should be converted to a `FlutterImageView`.
-  @Deprecated(
-    'No longer necessary to improve performance. '
-    'This feature was deprecated after v2.11.0-0.1.pre.',
-  )
-  static Future<void> synchronizeToNativeViewHierarchy(bool yes) async {}
-
   // TODO(amirh): reference the iOS plugin API for registering a UIView factory once it lands.
   /// This is work in progress, not yet ready to be used, and requires a custom engine build. Creates a controller for a new iOS UIView.
   ///