Many type fixes.

lib/compiler/implementation/dart2js.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.
 
 #library('dart2js');
 
 #import('dart:io');
 #import('dart:uri');
 #import('dart:utf');
 
@@ skipping 125 matching lines @@
 void writeString(Uri uri, String text) {
   if (uri.scheme != 'file') {
     throw new AbortLeg('unhandled scheme ${uri.scheme}');
   }
   var file = new File(uri.path).openSync(FileMode.WRITE);
   file.writeStringSync(text);
   file.closeSync();
 }
 
 String readAll(String filename) {
-  var file = (new File(filename)).openSync();
+  var file = (new File(filename)).openSync(FileMode.READ);
   var length = file.lengthSync();
   var buffer = new List<int>(length);
   var bytes = file.readListSync(buffer, 0, length);
   file.closeSync();
   return new String.fromCharCodes(new Utf8Decoder(buffer).decodeRest());
 }
 
 String getCurrentDirectory() {
   String dir = new File(".").fullPathSync();
   if (dir.endsWith("/")) return dir;
   return "$dir/";
 }