Make the new Mojo EDK work on XP.

mojo/edk/test/multiprocess_test_helper.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/test/multiprocess_test_helper.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "build/build_config.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
 
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
 namespace mojo {
 namespace edk {
 namespace test {
 
 MultiprocessTestHelper::MultiprocessTestHelper() {
   platform_channel_pair_.reset(new PlatformChannelPair());
   server_platform_handle = platform_channel_pair_->PassServerHandle();
 }
 
 MultiprocessTestHelper::~MultiprocessTestHelper() {
@@ skipping 28 matching lines @@
       command_line.AppendSwitchASCII(switch_string, switch_value);
     else
       command_line.AppendSwitch(switch_string);
   }
 
   base::LaunchOptions options;
 #if defined(OS_POSIX)
   options.fds_to_remap = &handle_passing_info;
 #elif defined(OS_WIN)
   options.start_hidden = true;
-  options.handles_to_inherit = &handle_passing_info;
+  if (base::win::GetVersion() >= base::win::VERSION_VISTA)
+    options.handles_to_inherit = &handle_passing_info;
+  else
+    options.inherit_handles = true;
 #else
 #error "Not supported yet."
 #endif
 
   test_child_ =
       base::SpawnMultiProcessTestChild(test_child_main, command_line, options);
   platform_channel_pair_->ChildProcessLaunched();
 
   CHECK(test_child_.IsValid());
 }
@@ skipping 19 matching lines @@
       PlatformChannelPair::PassClientHandleFromParentProcess(
           *base::CommandLine::ForCurrentProcess());
 }
 
 // static
 ScopedPlatformHandle MultiprocessTestHelper::client_platform_handle;
 
 }  // namespace test
 }  // namespace edk
 }  // namespace mojo