added bool type to named args in lib/io and lib/_internal

sdk/lib/io/directory.dart

Index: sdk/lib/io/directory.dart
diff --git a/sdk/lib/io/directory.dart b/sdk/lib/io/directory.dart
index 8e4cf12ab7aaa66f17e48f0f8620d05b2b8d2db0..671064cccc48554c9e38f40be249285242996e92 100644
--- a/sdk/lib/io/directory.dart
+++ b/sdk/lib/io/directory.dart
@@ -54,7 +54,7 @@ abstract class Directory implements FileSystemEntity {
    * directory once it has been created. If the directory cannot be
    * created the future completes with an exception.
    */
-  Future<Directory> create({recursive: false});
+  Future<Directory> create({bool recursive: false});
 
   /**
    * Synchronously creates the directory with this name.
@@ -65,7 +65,7 @@ abstract class Directory implements FileSystemEntity {
    *
    * If the directory cannot be created an exception is thrown.
    */
-  void createSync({recursive: false});
+  void createSync({bool recursive: false});
 
   /**
    * Creates a temporary directory with a name based on the current