Remove default AppContext and cleanup globals (#6999)

diff --git a/packages/flutter_tools/lib/src/commands/create.dart b/packages/flutter_tools/lib/src/commands/create.dart
index 7676e8c..3d21f16 100644
--- a/packages/flutter_tools/lib/src/commands/create.dart
+++ b/packages/flutter_tools/lib/src/commands/create.dart
@@ -12,6 +12,7 @@
 import '../base/utils.dart';
 import '../cache.dart';
 import '../dart/pub.dart';
+import '../doctor.dart';
 import '../globals.dart';
 import '../runner/flutter_command.dart';
 import '../template.dart';