Use a valid /prefetch argument when launching a process.

cloud_print/service/win/chrome_launcher.cc

 // Copyright (c) 2012 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 "cloud_print/service/win/chrome_launcher.h"
 
 #include <stddef.h>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 196 matching lines @@
 
     if (!chrome_path.empty()) {
       base::CommandLine cmd(chrome_path);
       CopyChromeSwitchesFromCurrentProcess(&cmd);
 
       // Required switches.
       cmd.AppendSwitchASCII(switches::kProcessType, switches::kServiceProcess);
       cmd.AppendSwitchPath(switches::kUserDataDir, user_data_);
       cmd.AppendSwitch(switches::kNoServiceAutorun);
 
+#if defined(OS_WIN)
+      cmd.AppendArg(switches::kPrefetchArgumentOther);
+#endif  // defined(OS_WIN)
+
       // Optional.
       cmd.AppendSwitch(switches::kDisableDefaultApps);
       cmd.AppendSwitch(switches::kDisableExtensions);
       cmd.AppendSwitch(switches::kDisableGpu);
       cmd.AppendSwitch(switches::kDisableSoftwareRasterizer);
       cmd.AppendSwitch(switches::kDisableSync);
       cmd.AppendSwitch(switches::kNoFirstRun);
       cmd.AppendSwitch(switches::kNoStartupWindow);
 
       base::win::ScopedHandle chrome_handle;
@@ skipping 97 matching lines @@
       LOG(ERROR) << "Chrome launch failed.";
       return std::string();
     }
     if (!json.empty()) {
       // Close chrome because Service State is ready.
       CloseChrome(chrome_process.Pass(), thread_id);
       return json;
     }
   }
 }