[pkg:vm_service] fix some analysis errors in the generated vm_service library

Change-Id: I5a09116928e2eff9125ca8033458e485e7f15acb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113756
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>

https://dart.googlesource.com/sdk/+/209c6f8ab93cbbe810a786bb5b78301d27ec26ab
diff --git a/commits.json b/commits.json
index 9ba8896..2cda8dd 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"f4591a73a5c7ecf6cc3c28ffebcedb70823e2b21",
   "external/github.com/flutter/flutter":"4d81b0c9708f57e545e96f0e6817f5eab3fc68ee",
-  "sdk":"b52b2c39101794cd215783ba832f121e70fbe5b6"
+  "sdk":"209c6f8ab93cbbe810a786bb5b78301d27ec26ab"
 }
\ No newline at end of file