Really remove io support when dart:io is unsupported.

runtime/bin/process.cc

 // 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.
 
+#if !defined(DART_IO_DISABLED)
+
+#include "bin/process.h"
+
 #include "bin/dartutils.h"
 #include "bin/io_buffer.h"
 #include "bin/log.h"
 #include "bin/platform.h"
-#include "bin/process.h"
 #include "bin/socket.h"
 #include "bin/utils.h"
 
 #include "include/dart_api.h"
 
 namespace dart {
 namespace bin {
 
 static const int kProcessIdNativeField = 0;
 
-int Process::global_exit_code_ = 0;
-Mutex* Process::global_exit_code_mutex_ = new Mutex();
-
 // Extract an array of C strings from a list of Dart strings.
 static char** ExtractCStringList(Dart_Handle strings,
                                  Dart_Handle status_handle,
                                  const char* error_msg,
                                  intptr_t* length) {
   static const intptr_t kMaxArgumentListLength = 1024 * 1024;
   ASSERT(Dart_IsList(strings));
   intptr_t len = 0;
   Dart_Handle result = Dart_ListLength(strings, &len);
   if (Dart_IsError(result)) {
@@ skipping 327 matching lines @@
   uint8_t* buffer = NULL;
   Dart_Handle external_array = IOBuffer::Allocate(system_len, &buffer);
   if (!Dart_IsError(external_array)) {
     memmove(buffer, system_string, system_len);
   }
   Dart_SetReturnValue(args, external_array);
 }
 
 }  // namespace bin
 }  // namespace dart
+
+#endif  // !defined(DART_IO_DISABLED)