Move startup_helper_win.cc to separate target for incremental build

chrome/chrome_exe.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'chrome',
       'type': 'none',
       'dependencies': [ 'chrome_initial', ],
@@ skipping 47 matching lines @@
       },
       'sources': [
         'app/chrome_exe_main_aura.cc',
         'app/chrome_exe_main_mac.cc',
         'app/chrome_exe_main_win.cc',
         'app/chrome_exe_resource.h',
         'app/client_util.cc',
         'app/client_util.h',
         'app/signature_validator_win.cc',
         'app/signature_validator_win.h',
+        # Note that due to InitializeSandboxInfo, this must be directly linked
+        # into chrome.exe, not into a dependent.
         '<(DEPTH)/content/app/startup_helper_win.cc',
         '<(DEPTH)/content/public/common/content_switches.cc',
       ],
       'mac_bundle_resources': [
         'app/app-Info.plist',
       ],
       # TODO(mark): Come up with a fancier way to do this.  It should only
       # be necessary to list app-Info.plist once, not the three times it is
       # listed here.
       'mac_bundle_resources!': [
@@ skipping 613 matching lines @@
               'dependencies': [
                 'chrome_nacl_win64',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }