chrome_exe_main: name os-specific files according to naming pattern

chrome/chrome_exe.gypi

 # Copyright (c) 2010 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.
 
 {
   'target_defaults': {
     'variables': {
       'chrome_exe_target': 0,
     },
     'target_conditions': [
       ['chrome_exe_target==1', {
         'sources': [
           # .cc, .h, and .mm files under app that are used on all
           # platforms, including both 32-bit and 64-bit Windows.
           # Test files are not included.
           'app/breakpad_win.cc',
           'app/breakpad_win.h',
-          'app/chrome_exe_main.cc',
-          'app/chrome_exe_main.mm',
           'app/chrome_exe_main_gtk.cc',
+          'app/chrome_exe_main_mac.mm',
+          'app/chrome_exe_main_win.cc',
           'app/chrome_exe_resource.h',
           'app/client_util.cc',
           'app/client_util.h',
           'app/hard_error_handler_win.cc',
           'app/hard_error_handler_win.h',
           'app/scoped_ole_initializer.h',
         ],
         'mac_bundle_resources': [
           'app/app-Info.plist',
         ],
@@ skipping 88 matching lines @@
                 ],
                 'outputs': [
                     '<(PRODUCT_DIR)/First Run',
                 ],
                 'action': ['cp', '-f', '<@(_inputs)', '<@(_outputs)'],
                 'message': 'Copy first run complete sentinel file',
               },
             ],
           }, {  # 'OS!="win"
             'sources!': [
-              'app/chrome_exe_main.cc',
               'app/client_util.cc',
             ]
           }],
         ],
       }],
     ],
   },
   'targets': [
     {
       'target_name': 'chrome',
@@ skipping 445 matching lines @@
               'message':
                 'Copy the Localizable.strings files to the manifest bundle',
               'process_outputs_as_mac_bundle_resources': 1,
             },
           ],
         },
       ]
     }]
   ],
 }