Use a valid /prefetch argument when launching a process.

chrome/common/chrome_switches.h

 // 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.
 
 // Defines the shared command-line switches used by code in the Chrome
 // directory that don't have anywhere more specific to go.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
@@ skipping 341 matching lines @@
 #endif  // defined(OS_MACOSX)
 
 #if defined(OS_WIN)
 extern const char kCrashpadHandler[];
 extern const char kEnableCloudPrintXps[];
 extern const char kEnableProfileShortcutManager[];
 extern const char kForceDesktop[];
 extern const char kForceImmersive[];
 extern const char kHideIcons[];
 extern const char kNoNetworkProfileWarning[];
+extern const char kPrefetchArgumentBrowserBackground[];
+extern const char kPrefetchArgumentWatcher[];
 extern const char kRelaunchShortcut[];
 extern const char kShowIcons[];
 extern const char kUninstall[];
 extern const char kViewerLaunchViaAppId[];
 extern const char kWaitForMutex[];
 extern const char kWatcherProcess[];
 extern const char kWindows8Search[];
 #endif  // defined(OS_WIN)
 
 #if defined(ENABLE_IPC_FUZZER)
@@ skipping 42 matching lines @@
 #if defined(ENABLE_TASK_MANAGER)
 bool NewTaskManagerEnabled();
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_