[dart2js] Remove `Symbol.validated`.

Bug: https://github.com/dart-lang/sdk/issues/46397
Fixes: https://github.com/dart-lang/sdk/issues/46397
Change-Id: I307f486deb7afe72c347bfeb6779cb9389d1ff13
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/204601
Reviewed-by: Stephen Adams <sra@google.com>
Commit-Queue: Mayank Patke <fishythefish@google.com>

https://dart.googlesource.com/sdk/+/3405b943389fa0d56fd335361ac3fa861057c52e
diff --git a/commits.json b/commits.json
index 12698fb..2663606 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"7aa61d664fc3234265a818646ecf22230535880f",
   "external/github.com/flutter/flutter":"2130cf9c02375b270e3a14d337edafc9b6336173",
-  "sdk":"c54ce0b969e5b3a7449f20e9ddf193e96556c519"
+  "sdk":"3405b943389fa0d56fd335361ac3fa861057c52e"
 }
\ No newline at end of file