Change List constructors.

tests/standalone/io/regress-1925.dart

Index: tests/standalone/io/regress-1925.dart
diff --git a/tests/standalone/io/regress-1925.dart b/tests/standalone/io/regress-1925.dart
index 6e68160c18628a85dbfdf21117796442b2e0c117..d800bdb942af6b9782c01ef6d80fe446c3f2e754 100644
--- a/tests/standalone/io/regress-1925.dart
+++ b/tests/standalone/io/regress-1925.dart
@@ -19,7 +19,7 @@ class Regress1925TestServer extends TestingServer {
     socket.onError = (e) => Expect.fail("Server socket error $e");
     socket.inputStream.onClosed = () => socket.outputStream.close();
     socket.inputStream.onData = () {
-      var buffer = new List(1);
+      var buffer = new List.fixedLength(1);
       var read = socket.inputStream.readInto(buffer);
       Expect.equals(1, read);
       socket.outputStream.writeFrom(buffer, 0, read);
@@ -36,7 +36,7 @@ class Regress1925Test extends TestingServerTest {
   void run() {
 
     var count = 0;
-    var buffer = new List(5);
+    var buffer = new List.fixedLength(5);
     Socket socket = new Socket(TestingServer.HOST, _port);
     socket.onConnect = () {
       socket.outputStream.write("12345".charCodes);