Use a valid /prefetch argument when launching a process.

components/nacl.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'target_defaults': {
     'variables': {
@@ skipping 121 matching lines @@
               'sources': [
                 '../components/nacl/zygote/nacl_fork_delegate_linux.cc',
                 '../components/nacl/zygote/nacl_fork_delegate_linux.h',
               ],
               'dependencies': [
                 # Required by nacl_fork_delegate_linux.cc.
                 '../sandbox/sandbox.gyp:suid_sandbox_client',
                 '../sandbox/sandbox.gyp:sandbox_services',
               ]
             }],
+            ['OS=="win"', {
+              'dependencies': [
+                # TODO(fdoray): Remove this once the PreRead field trial has
+                # expired. crbug.com/577698
+                '../components/components.gyp:startup_metric_utils_common',
+              ]
+            }],
           ],
         },
         {
           # GN version: //components/nacl/renderer
           'target_name': 'nacl_renderer',
           'type': 'static_library',
           'sources': [
             'nacl/renderer/file_downloader.cc',
             'nacl/renderer/file_downloader.h',
             'nacl/renderer/histogram.cc',
@@ skipping 311 matching lines @@
       ],
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../content/content.gyp:content_common',
       ],
     },
   ]
 }