Really remove io support when dart:io is unsupported.

runtime/bin/process_win.cc

 // 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.
 
+#if !defined(DART_IO_DISABLED)
+
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/process.h"
 
 #include <process.h>  // NOLINT
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "bin/eventhandler.h"
 #include "bin/lockers.h"
 #include "bin/log.h"
 #include "bin/socket.h"
 #include "bin/thread.h"
 #include "bin/utils.h"
 #include "bin/utils_win.h"
 
 namespace dart {
 namespace bin {
 
 static const int kReadHandle = 0;
 static const int kWriteHandle = 1;
 
+int Process::global_exit_code_ = 0;
+Mutex* Process::global_exit_code_mutex_ = new Mutex();
 
 // ProcessInfo is used to map a process id to the process handle,
 // wait handle for registered exit code event and the pipe used to
 // communicate the exit code of the process to Dart.
 // ProcessInfo objects are kept in the static singly-linked
 // ProcessInfoList.
 class ProcessInfo {
  public:
   ProcessInfo(DWORD process_id,
               HANDLE process_handle,
@@ skipping 1037 matching lines @@
       USE(SetConsoleCtrlHandler(SignalHandler, false));
     }
   }
   delete handler;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)
+
+#endif  // !defined(DART_IO_DISABLED)