Always use a /prefetch:# switch when launching a process on Windows.

components/nacl/browser/BUILD.gn

 # Copyright 2015 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/features.gni")
 
 assert(enable_nacl)
 
 source_set("browser") {
   sources = [
@@ skipping 45 matching lines @@
 
     deps += [
       "//components/nacl/loader:nacl_helper_integration",
       "//sandbox/linux:sandbox_services",
       "//sandbox/linux:suid_sandbox_client",
     ]
 
     data_deps += [ "//components/nacl/loader:helper_nonsfi" ]
   }
 
-  if (is_win) {
-    deps += [
-      # TODO(fdoray): Remove this once the PreRead field trial has expired.
-      # crbug.com/577698
-      "//components/startup_metric_utils/common",
-    ]
-  }
-
   if (is_win && current_cpu == "x86") {
     data_deps += [ "//components/nacl/broker:nacl64" ]
   }
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "nacl_file_host_unittest.cc",
     "nacl_process_host_unittest.cc",
     "nacl_validation_cache_unittest.cc",
     "pnacl_host_unittest.cc",
     "pnacl_translation_cache_unittest.cc",
     "test_nacl_browser_delegate.cc",
   ]
 
   deps = [
     ":browser",
     "//base",
     "//components/nacl/common",
     "//content/test:test_support",
     "//net:test_support",
   ]
 
   if (is_linux) {
     sources += [ "../zygote/nacl_fork_delegate_linux_unittest.cc" ]
   }
 }