[pub] Cherry pick fix

This contains only the single commit of dart-lang/pub#2556 cherry picked on a branch

Change-Id: I07147955e4bf0e4c5ca077dcaeffd431c991ebb9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/153962
Reviewed-by: Jonas Jensen <[email protected]>
Commit-Queue: Sigurd Meldgaard <[email protected]>

Author: sigurdm

DEPS

@@ -127,7 +127,7 @@ vars = {
   "ply_rev": "604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_rev": "86fbb2cde9bbc66c8d159909d2f65a5981ea5b50",
   "protobuf_rev": "3746c8fd3f2b0147623a8e3db89c3ff4330de760",
-  "pub_rev": "6178cdf284baf2345d1ea578b7176a754aa576fe",
+  "pub_rev": "85bdb898aeb2ac7cea76489ba0bf4e52ff7a79bf",
   "pub_semver_tag": "v1.4.4",
   "quiver-dart_tag": "246e754fe45cecb6aa5f3f13b4ed61037ff0d784",
   "resource_rev": "f8e37558a1c4f54550aa463b88a6a831e3e33cd6",