Before a import of, say "hello.dart" was printed as
"import './hello.dart'".
Now instead it is printed as "import 'hello.dart'".
At the same time we get rid of a dependency.
Change-Id: I352f0f507168fde75358704ec9bf0e248bb8179d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98480
Reviewed-by: Kevin Millikin <kmillikin@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>