Fix various nits in VM patch files.

runtime/bin/process_patch.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.
 
 @patch class _WindowsCodePageDecoder {
   @patch static String _decodeBytes(List<int> bytes)
       native "SystemEncodingToString";
 }
 
 
@@ skipping 164 matching lines @@
 // The NativeFieldWrapperClass1 can not be used with a mixin, due to missing
 // implicit constructor.
 class _ProcessImplNativeWrapper extends NativeFieldWrapperClass1 {}
 
 class _ProcessImpl extends _ProcessImplNativeWrapper implements Process {
   _ProcessResourceInfo _resourceInfo;
   static bool connectedResourceHandler = false;
 
   _ProcessImpl(String path,
                List<String> arguments,
-               String this._workingDirectory,
+               this._workingDirectory,
                Map<String, String> environment,
                bool includeParentEnvironment,
                bool runInShell,
                ProcessStartMode mode) : super() {
     if (!connectedResourceHandler) {
       registerExtension('ext.dart.io.getProcesses',
                         _ProcessResourceInfo.getStartedProcesses);
       registerExtension('ext.dart.io.getProcessById',
                         _ProcessResourceInfo.getProcessInfoMapById);
       connectedResourceHandler = true;
@@ skipping 399 matching lines @@
       Encoding stderrEncoding) {
   var process = new _ProcessImpl(executable,
                                  arguments,
                                  workingDirectory,
                                  environment,
                                  includeParentEnvironment,
                                  runInShell,
                                  ProcessStartMode.NORMAL);
   return process._runAndWait(stdoutEncoding, stderrEncoding);
 }