Fix bad space handling in Uris.

sdk/lib/_internal/compiler/implementation/dart2js.dart

 // Copyright (c) 2013, 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.cmdline;
 
 import 'dart:async'
     show Future, EventSink;
 import 'dart:io'
     show exit, File, FileMode, Platform, RandomAccessFile;
@@ skipping 358 matching lines @@
       }
     } else {
       uri = out.resolve('$name.$extension');
     }
 
     if (uri.scheme != 'file') {
       fail('Error: Unhandled scheme ${uri.scheme} in $uri.');
     }
 
     RandomAccessFile output =
-        new File(uriPathToNative(uri.path)).openSync(mode: FileMode.WRITE);
+        new File(uri.toFilePath()).openSync(mode: FileMode.WRITE);
     int charactersWritten = 0;
 
     writeStringSync(String data) {
       // Write the data in chunks of 8kb, otherwise we risk running OOM
       int chunkSize = 8*1024;
 
       int offset = 0;
       while (offset < data.length) {
         output.writeStringSync(
             data.substring(offset, math.min(offset + chunkSize, data.length)));
@@ skipping 48 matching lines @@
 class AbortLeg {
   final message;
   AbortLeg(this.message);
   toString() => 'Aborted due to --throw-on-error: $message';
 }
 
 void writeString(Uri uri, String text) {
   if (uri.scheme != 'file') {
     fail('Error: Unhandled scheme ${uri.scheme}.');
   }
-  var file = new File(uriPathToNative(uri.path)).openSync(mode: FileMode.WRITE);
+  var file = new File(uri.toFilePath()).openSync(mode: FileMode.WRITE);
   file.writeStringSync(text);
   file.closeSync();
 }
 
 void fail(String message) {
   if (diagnosticHandler != null) {
     diagnosticHandler.diagnosticHandler(
         null, -1, -1, message, api.Diagnostic.ERROR);
   } else {
     print(message);
@@ skipping 163 matching lines @@
     }
   }
 
   try {
     return compilerMain(arguments).catchError(onError);
   } catch (exception, trace) {
     onError(exception, trace);
     return new Future.value();
   }
 }