Move isolate_channel to it's own import (dart-lang/stream_channel#39)

Closes dart-lang/stream_channel#36

This allows the default import to work without triggering any warnings
on the web due to transitively importing `dart:isolate`. This is
required to allow restricting imports based on platform.
3 files changed
tree: 28718adcdeaa01f80556626c2df667f922d41379
  1. pkgs/