Remove duplicate .packages entry
Remove duplicate .packages entry

Change-Id: Ia6e4f937d8e19b043783a94d28b9830d61b7bbaa
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/197800
Reviewed-by: Alexander Aprelev <dfb74c35a357c2059971a4bf7fe26b6a7c18085d@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk