Fix file buffering code that uses RemoveRange on a fixed-length Uint8 array.

runtime/bin/file_impl.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.
 
 class _FileInputStream extends _BaseDataInputStream implements InputStream {
   _FileInputStream(String name)
       : _data = [],
         _position = 0,
         _filePosition = 0 {
     var file = new File(name);
@@ skipping 54 matching lines @@
       _closeFile();
       return;
     }
     if (_data.length != size) {
       _data = new Uint8List(size);
     }
     var future = _openedFile.readList(_data, 0, _data.length);
     future.then((read) {
       _filePosition += read;
       if (read != _data.length) {
-        _data.removeRange(read, _data.length - read);
+        _data = _data.getRange(0, read);
       }
       _position = 0;
 
       if (_fileLength == _filePosition) {
         _closeFile();
       }
       _checkScheduleCallbacks();
     });
   }
 
@@ skipping 1055 matching lines @@
           new FileIOException("File closed '$_name'"));
     });
     return completer.future;
   }
 
   final String _name;
   int _id;
 
   SendPort _fileService;
 }