Code cleanup (mostly io lib and some http lib).

sdk/lib/io/platform_impl.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.
 
 part of dart.io;
 
 class _Platform {
   external static int _numberOfProcessors();
   external static String _pathSeparator();
   external static String _operatingSystem();
   external static _localHostname();
   external static _executable();
   external static _environment();
   external static List<String> _executableArguments();
   external static String _packageRoot();
   external static String _version();
 
+  static String executable = _executable();
+  static String packageRoot = _packageRoot();
+
   static int get numberOfProcessors => _numberOfProcessors();
   static String get pathSeparator => _pathSeparator();
   static String get operatingSystem => _operatingSystem();
   static Uri script = _script();
   static Uri _script() {
     // The embedder (Dart executable) creates the Platform._nativeScript field.
     var s = Platform._nativeScript;
     if (s.startsWith('http:') ||
         s.startsWith('https:') ||
         s.startsWith('file:')) {
       return Uri.parse(s);
     } else {
       return Uri.base.resolveUri(new Uri.file(s));
     }
   }
 
   static String get localHostname {
     var result = _localHostname();
     if (result is OSError) {
       throw result;
     } else {
       return result;
     }
   }
 
-  static String executable = _executable();
-  static String packageRoot = _packageRoot();
   static List<String> get executableArguments => _executableArguments();
 
   static Map<String, String> get environment {
     var env = _environment();
     if (env is OSError) {
       throw env;
     } else {
       var isWindows = operatingSystem == 'windows';
       var result = isWindows ? new _CaseInsensitiveStringMap() : new Map();
       for (var str in env) {
@@ skipping 14 matching lines @@
       return result;
     }
   }
 
   static String get version => _version();
 }
 
 // Environment variables are case-insensitive on Windows. In order
 // to reflect that we use a case-insensitive string map on Windows.
 class _CaseInsensitiveStringMap<V> implements Map<String, V> {
+  Map<String, V> _map;
+
   _CaseInsensitiveStringMap() : _map = new Map<String, V>();
 
   _CaseInsensitiveStringMap.from(Map<String, V> other)
       : _map = new Map<String, V>() {
     other.forEach((String key, V value) {
       _map[key.toUpperCase()] = value;
     });
   }
 
   bool containsKey(String key) => _map.containsKey(key.toUpperCase());
   bool containsValue(Object value) => _map.containsValue(value);
   V operator [](String key) => _map[key.toUpperCase()];
   void operator []=(String key, V value) {
     _map[key.toUpperCase()] = value;
   }
   V putIfAbsent(String key, V ifAbsent()) {
     _map.putIfAbsent(key.toUpperCase(), ifAbsent);
   }
   addAll(Map other) {
     other.forEach((key, value) => this[key.toUpperCase()] = value);
   }
   V remove(String key) => _map.remove(key.toUpperCase());
   void clear() => _map.clear();
   void forEach(void f(String key, V value)) => _map.forEach(f);
   Iterable<String> get keys => _map.keys;
   Iterable<V> get values => _map.values;
   int get length => _map.length;
   bool get isEmpty => _map.isEmpty;
   bool get isNotEmpty => _map.isNotEmpty;
-
-  Map<String, V> _map;
 }