Remove LinkedNodeVariablesDeclaration.

We don't need it anymore - we can go up the AST hierarchy to the
enclosing TopLevelVariableDeclaration.

R=brianwilkerson@google.com, paulberry@google.com

Change-Id: Iadc9985bb5bcaa465c3505794ceac51e7b06a930
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103564
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>

https://dart.googlesource.com/sdk/+/4b7c05f2ce45ef0dba66c78f11b31011ea9ab643
diff --git a/commits.json b/commits.json
index 35a9fa9..fcfdcc8 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"01b8c078cb00f1b853c01a95405ca125b2114b1e",
   "external/github.com/flutter/flutter":"c6129b4e85c596a93b0c253352d0bbdfcf04695d",
-  "sdk":"6e1f628f19c1ed0ccd2b12a86d09a78ad34767bb"
+  "sdk":"4b7c05f2ce45ef0dba66c78f11b31011ea9ab643"
 }
\ No newline at end of file