Moved deleting directory to whenComplete

pkg/docgen/lib/docgen.dart

 // Copyright (c) 2013, 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.
 
 /**
  * **docgen** is a tool for creating machine readable representations of Dart
  * code metadata, including: classes, members, comments and annotations.
  *
  * docgen is run on a `.dart` file or a directory containing `.dart` files.
  *
@@ skipping 136 matching lines @@
 }
 
 /**
  * Analyzes set of libraries by getting a mirror system and triggers the
  * documentation of the libraries.
  */
 Future<MirrorSystem> getMirrorSystem(List<String> args, {String packageRoot,
     bool parseSdk:false}) {
   var libraries = !parseSdk ? _listLibraries(args) : _listSdk();
   if (libraries.isEmpty) throw new StateError('No Libraries.');
-  // DART_SDK should be set to the root of the SDK library.
-  var sdkRoot = Platform.environment['DART_SDK'];
-  if (sdkRoot != null) {
-    logger.info('Using DART_SDK to find SDK at $sdkRoot');
-  } else {
-    // If DART_SDK is not defined in the environment,
-    // assuming the dart executable is from the Dart SDK folder inside bin.
-    sdkRoot = path.join(path.dirname(path.dirname(path.dirname(path.dirname(
+  // Finds the root of SDK library based off the location of docgen.
+  var sdkRoot = path.join(path.dirname(path.dirname(path.dirname(path.dirname(
         path.absolute(new Options().script))))), 'sdk');
-    logger.info('SDK Root: ${sdkRoot}');
-  }
+  logger.info('SDK Root: ${sdkRoot}');
   return _analyzeLibraries(libraries, sdkRoot, packageRoot: packageRoot);
 }
 
 /**
  * Analyzes set of libraries and provides a mirror system which can be used
  * for static inspection of the source code.
  */
 Future<MirrorSystem> _analyzeLibraries(List<String> libraries,
       String libraryRoot, {String packageRoot}) {
   SourceFileProvider provider = new SourceFileProvider();
@@ skipping 559 matching lines @@
   String outer;
   List<Type> inner;
   
   Type(this.outer, this.inner);
   
   Map toMap() => {
       'outer': outer,
       'inner': new List.from(inner.map((e) => e.toMap()))
     };
 }