Move startup_helper_win.cc to separate target for incremental build

content/content_shell.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.
 
 {
   'variables': {
     'content_shell_product_name': 'Content Shell',
     # The "19" is so that sites that sniff for version think that this is
     # something reasonably current; the "77.34.5" is a hint that this isn't a
     # standard Chrome.
@@ skipping 479 matching lines @@
       'dependencies': [
         'content_shell_lib',
         'content_shell_pak',
         '../third_party/mesa/mesa.gyp:osmesa',
         '../tools/imagediff/image_diff.gyp:image_diff',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
-        'app/startup_helper_win.cc',
         'shell/app/shell_main.cc',
       ],
       'mac_bundle_resources': [
         'shell/app/app.icns',
         'shell/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 585 matching lines @@
                 '--input_symbol', '<(PRODUCT_DIR)/content_shell.exe.pdb',
                 '--destination_dir', '<(dest_dir)',
               ],
             },
           ],
         },
       ],
     }],  # OS=="win" and fastbuild==0 and target_arch=="ia32"
   ]
 }