Provisionally stop working around issues 9252 and 9253.

utils/pub/source.dart

 // Copyright (c) 2012, 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 source;
 
 import 'dart:async';
 
 import '../../pkg/pathos/lib/path.dart' as path;
 
@@ skipping 101 matching lines @@
     return systemCacheDirectory(id).then((p) {
       packageDir = p;
 
       // See if it's already cached.
       if (!dirExists(packageDir)) return false;
 
       return _isCachedPackageCorrupted(packageDir).then((isCorrupted) {
         if (!isCorrupted) return true;
 
         // Busted, so wipe out the package and reinstall.
-        return deleteDir(packageDir).then((_) => false);
+        deleteDir(packageDir);
+        return false;
       });
     }).then((isInstalled) {
       if (isInstalled) return true;
       ensureDir(path.dirname(packageDir));
       return install(id, packageDir);
     }).then((found) {
       if (!found) throw 'Package $id not found.';
       return new Package.load(id.name, packageDir, systemCache.sources);
     });
   }
@@ skipping 84 matching lines @@
   Future<PackageId> resolveId(PackageId id) => new Future.immediate(id);
   
   /// Returns the [Package]s that have been installed in the system cache.
   Future<List<Package>> getCachedPackages() {
     if (shouldCache) throw "Source $name must implement this.";
   }
 
   /// Returns the source's name.
   String toString() => name;
 }