Revert "Use backend targets to run Kernel transformations in Fasta"

pkg/kernel/lib/target/vm_fasta.dart

-// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-library kernel.target.vm_fasta;
-
-import '../ast.dart' show Program, Library;
-import '../core_types.dart' show CoreTypes;
-import '../class_hierarchy.dart' show ClassHierarchy;
-
-import '../transformations/mixin_full_resolution.dart' as transformMixins
-    show transformLibraries;
-import '../transformations/continuation.dart' as transformAsync
-    show transformLibraries;
-import '../transformations/erasure.dart' as tranformErasure
-    show transformLibraries;
-
-import 'targets.dart' show TargetFlags;
-import 'vm.dart' as vm_target;
-
-class VmFastaTarget extends vm_target.VmTarget {
-  VmFastaTarget(TargetFlags flags) : super(flags);
-
-  String get name => "vm_fasta";
-
-  void performModularTransformationsOnLibraries(
-      CoreTypes coreTypes, ClassHierarchy hierarchy, List<Library> libraries,
-      {void logger(String msg)}) {
-    transformMixins.transformLibraries(this, coreTypes, hierarchy, libraries);
-    logger?.call("Transformed mixin applications");
-
-    // TODO(ahe): Don't generate type variables in the first place.
-    if (!strongMode) {
-      tranformErasure.transformLibraries(coreTypes, libraries);
-      logger?.call("Erased type variables in generic methods");
-    }
-
-    // TODO(kmillikin): Make this run on a per-method basis.
-    transformAsync.transformLibraries(coreTypes, libraries);
-    logger?.call("Transformed async methods");
-  }
-
-  void performGlobalTransformations(CoreTypes coreTypes, Program program,
-      {void logger(String msg)}) {}
-}