Use a valid /prefetch argument when launching a process.

chrome/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
@@ skipping 96 matching lines @@
         "app/chrome_exe_load_config_win.cc",
         "app/chrome_exe_main_win.cc",
         "app/chrome_watcher_client_win.cc",
         "app/chrome_watcher_client_win.h",
         "app/chrome_watcher_command_line_win.cc",
         "app/chrome_watcher_command_line_win.h",
         "app/kasko_client.cc",
         "app/kasko_client.h",
         "app/main_dll_loader_win.cc",
         "app/main_dll_loader_win.h",
+        "app/prefetch_argument_win.cc",
+        "app/prefetch_argument_win.h",
         "common/crash_keys.cc",
         "common/crash_keys.h",
       ]
 
       deps += [
         ":chrome_dll",
         ":chrome_exe_version",
         ":file_pre_reader",
 
         # 'chrome_nacl_win64" TODO(GYP) bug 512869
@@ skipping 938 matching lines @@
       "//chrome/app/theme/$branding_path_component/product_logo_48.png",
       "//chrome/tools/build/linux/chrome-wrapper",
       "//third_party/xdg-utils/scripts/xdg-mime",
       "//third_party/xdg-utils/scripts/xdg-settings",
     ]
     outputs = [
       "$root_out_dir/{{source_file_part}}",
     ]
   }
 }