Hide VM-only coreimpl List implementation types. These should not be

runtime/bin/process_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.
 
 _exit(int status) native "Exit";
 
 class _ProcessStartStatus {
   int _errorCode;  // Set to OS error code if process start failed.
   String _errorMessage;  // Set to OS error message if process start failed.
 }
@@ skipping 11 matching lines @@
                  ProcessOptions options) {
     if (path is !String) {
       throw new ArgumentError("Path is not a String: $path");
     }
     _path = path;
 
     if (arguments is !List) {
       throw new ArgumentError("Arguments is not a List: $arguments");
     }
     int len = arguments.length;
-    _arguments = new ObjectArray<String>(len);
+    _arguments = new List<String>(len);
     for (int i = 0; i < len; i++) {
       var arg = arguments[i];
       if (arg is !String) {
         throw new ArgumentError("Non-string argument: $arg");
       }
       _arguments[i] = arguments[i];
       if (Platform.operatingSystem == 'windows') {
         _arguments[i] = _windowsArgumentEscape(_arguments[i]);
       }
     }
@@ skipping 232 matching lines @@
 
   void _reportError(e) {
     if (_onError != null) {
       _onError(e);
     } else {
       throw e;
     }
   }
 
   String _path;
-  ObjectArray<String> _arguments;
+  List<String> _arguments;
   String _workingDirectory;
   List<String> _environment;
   // Private methods of _Socket are used by _in, _out, and _err.
   _Socket _in;
   _Socket _out;
   _Socket _err;
   Socket _exitHandler;
   bool _closed;
   bool _ended;
   bool _started;
@@ skipping 94 matching lines @@
 
 class _ProcessResult implements ProcessResult {
   const _ProcessResult(int this.exitCode,
                        String this.stdout,
                        String this.stderr);
 
   final int exitCode;
   final String stdout;
   final String stderr;
 }