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

sdk/lib/io/platform_impl.dart

Index: sdk/lib/io/platform_impl.dart
diff --git a/sdk/lib/io/platform_impl.dart b/sdk/lib/io/platform_impl.dart
index 40fe2f0cf79a7b557d2dfa1c3385262426fd1c19..c9383b18deb90b1fb9af4853f7cc95486f90729b 100644
--- a/sdk/lib/io/platform_impl.dart
+++ b/sdk/lib/io/platform_impl.dart
@@ -15,6 +15,9 @@ class _Platform {
   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();
@@ -40,8 +43,6 @@ class _Platform {
     }
   }
 
-  static String executable = _executable();
-  static String packageRoot = _packageRoot();
   static List<String> get executableArguments => _executableArguments();
 
   static Map<String, String> get environment {
@@ -76,6 +77,8 @@ class _Platform {
 // 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)
@@ -105,6 +108,4 @@ class _CaseInsensitiveStringMap<V> implements Map<String, V> {
   int get length => _map.length;
   bool get isEmpty => _map.isEmpty;
   bool get isNotEmpty => _map.isNotEmpty;
-
-  Map<String, V> _map;
 }