Create correctly structured framework for macOS (#38748)

https://dart.googlesource.com/external/github.com/flutter/flutter/+/2504a416bb67dff179f2e7cd9b939016501f5da9
diff --git a/commits.json b/commits.json
index 84940c7..4fb0b0a 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"d212b9ab33a04a889a24952f76b3ba6b41e1df14",
-  "external/github.com/flutter/flutter":"700020fc6bd08f373042b9d1d38747c9b2a32d8c",
+  "external/github.com/flutter/flutter":"2504a416bb67dff179f2e7cd9b939016501f5da9",
   "sdk":"3865187956cad51bc7065d30beb8ab89702b7953"
 }
\ No newline at end of file