Remove closure_conversion.dart from pkg/kernel.

pkg/kernel/bin/transform.dart

 #!/usr/bin/env 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.
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:kernel/kernel.dart';
 import 'package:kernel/checks.dart' as checks;
 import 'package:kernel/transformations/continuation.dart' as cont;
 import 'package:kernel/transformations/infer_values.dart' as infer_values;
 import 'package:kernel/transformations/mixin_full_resolution.dart' as mix;
-import 'package:kernel/transformations/closure_conversion.dart' as closures;
 import 'package:kernel/transformations/treeshaker.dart' as treeshaker;
 
 import 'batch_util.dart';
 
 ArgParser parser = new ArgParser()
   ..addOption('format',
       abbr: 'f',
       allowed: ['text', 'bin'],
       defaultsTo: 'bin',
       help: 'Output format.')
-  ..addOption('out',
-      abbr: 'o',
-      help: 'Output file.',
-      defaultsTo: null)
+  ..addOption('out', abbr: 'o', help: 'Output file.', defaultsTo: null)
   ..addFlag('verbose',
       abbr: 'v',
       negatable: false,
       help: 'Be verbose (e.g. prints transformed main library).',
       defaultsTo: false)
   ..addOption('transformation',
       abbr: 't',
       help: 'The transformation to apply.',
       defaultsTo: 'continuation');
 
@@ skipping 29 matching lines @@
   switch (options['transformation']) {
     case 'continuation':
       program = cont.transformProgram(program);
       break;
     case 'infervalues':
       program = infer_values.transformProgram(program);
       break;
     case 'resolve-mixins':
       program = mix.transformProgram(program);
       break;
-    case 'closures':
-      program = closures.transformProgram(program);
-      break;
     case 'treeshake':
       program = treeshaker.transformProgram(program);
       break;
-    default: throw 'Unknown transformation';
+    default:
+      throw 'Unknown transformation';
   }
 
   program.accept(new checks.CheckParentPointers());
 
   if (format == 'text') {
     writeProgramToText(program, path: output);
   } else {
     assert(format == 'bin');
     await writeProgramToBinary(program, output);
   }
 
   if (verbose) {
     writeLibraryToText(program.mainMethod.parent as Library);
   }
 
   return CompilerOutcome.Ok;
 }