Migrator: use pub.bat on Windows

Fixes https://github.com/dart-lang/sdk/issues/42102

Change-Id: Ic2dd785a84835402c7af3ef7b8d15285585a0afb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149386
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Mike Fairhurst <mfairhurst@google.com>
Reviewed-by: Janice Collins <jcollins@google.com>

https://dart.googlesource.com/sdk/+/2dea325d871132e84eb9d624ebf7f0fff95c3398
1 file changed
tree: 0829db9bc37d5d339c84a805979c5566a6bf5d08
  1. commits.json