Wrap VariableDeclarations in Blocks as specified by Kernel.

pkg/front_end/testcases/rasta/issue_000069.dart.direct.expect

Index: pkg/front_end/testcases/rasta/issue_000069.dart.direct.expect
diff --git a/pkg/front_end/testcases/rasta/issue_000069.dart.direct.expect b/pkg/front_end/testcases/rasta/issue_000069.dart.direct.expect
index d663f146cc57b4339783c061338f04991805f239..9b3d5ea0d1e44b7d21bd855c5dbc74b8dfab3e37 100644
--- a/pkg/front_end/testcases/rasta/issue_000069.dart.direct.expect
+++ b/pkg/front_end/testcases/rasta/issue_000069.dart.direct.expect
@@ -4,6 +4,7 @@ import self as self;
 static method main() → dynamic {
   dynamic x;
   dynamic i = 0;
-  while ((let final dynamic #t1 = i in let final dynamic #t2 = i = #t1.+(1) in #t1).<(5))
+  while ((let final dynamic #t1 = i in let final dynamic #t2 = i = #t1.+(1) in #t1).<(5)) {
     dynamic x = i;
+  }
 }