Change List constructors.

sdk/lib/io/directory_impl.dart

Index: sdk/lib/io/directory_impl.dart
diff --git a/sdk/lib/io/directory_impl.dart b/sdk/lib/io/directory_impl.dart
index 4a9d5c1c861cc00ec640ea3e56dcb0163cd90dc2..fadf841c89d93e78260c8ea5ab6e9ad85af4255e 100644
--- a/sdk/lib/io/directory_impl.dart
+++ b/sdk/lib/io/directory_impl.dart
@@ -29,7 +29,7 @@ class _Directory implements Directory {
 
   Future<bool> exists() {
     _ensureDirectoryService();
-    List request = new List(2);
+    List request = new List.fixedLength(2);
     request[0] = EXISTS_REQUEST;
     request[1] = _path;
     return _directoryService.call(request).then((response) {
@@ -77,7 +77,7 @@ class _Directory implements Directory {
   Future<Directory> create({recursive: false}) {
     if (recursive) return createRecursively();
     _ensureDirectoryService();
-    List request = new List(2);
+    List request = new List.fixedLength(2);
     request[0] = CREATE_REQUEST;
     request[1] = _path;
     return _directoryService.call(request).then((response) {
@@ -110,7 +110,7 @@ class _Directory implements Directory {
 
   Future<Directory> createTemp() {
     _ensureDirectoryService();
-    List request = new List(2);
+    List request = new List.fixedLength(2);
     request[0] = CREATE_TEMP_REQUEST;
     request[1] = _path;
     return _directoryService.call(request).then((response) {
@@ -140,7 +140,7 @@ class _Directory implements Directory {
 
   Future<Directory> delete({recursive: false}) {
     _ensureDirectoryService();
-    List request = new List(3);
+    List request = new List.fixedLength(3);
     request[0] = DELETE_REQUEST;
     request[1] = _path;
     request[2] = recursive;
@@ -164,7 +164,7 @@ class _Directory implements Directory {
 
   Future<Directory> rename(String newPath) {
     _ensureDirectoryService();
-    List request = new List(3);
+    List request = new List.fixedLength(3);
     request[0] = RENAME_REQUEST;
     request[1] = _path;
     request[2] = newPath;
@@ -263,7 +263,7 @@ class _DirectoryLister implements DirectoryLister {
     final int RESPONSE_COMPLETE = 1;
     final int RESPONSE_ERROR = 2;
 
-    List request = new List(3);
+    List request = new List.fixedLength(3);
     request[0] = _Directory.LIST_REQUEST;
     request[1] = path;
     request[2] = recursive;