Migration: Remove "fantasy land" functionality

We're not currently working on this, and it has some dependencies that
interfere with publishing the migration tool.  If we wind up needing
it again, we can always revert.

Change-Id: Ia6219ac376cef77bda7470777eaf2bebf38769b4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149343
Commit-Queue: Janice Collins <jcollins@google.com>
Reviewed-by: Janice Collins <jcollins@google.com>

https://dart.googlesource.com/sdk/+/bf30eb53e2de5f8af4f6094a3af97989084fa44f
diff --git a/commits.json b/commits.json
index 26d4e70..1b0b09c 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"c5d012900f7db0dc5dc9afb46f76d16b87915db0",
   "external/github.com/flutter/flutter":"525c5ccde88263e7add90c52c10120b83dc6f643",
-  "sdk":"a45d66c6e9262e42391611ddfd5da0cc9be8a7c5"
+  "sdk":"bf30eb53e2de5f8af4f6094a3af97989084fa44f"
 }
\ No newline at end of file