Rearrange gyp files for Message Center

chrome/chrome_browser.gypi

 # Copyright 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': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2961 matching lines @@
             'browser/importer/nss_decryptor.cc',
             'browser/importer/nss_decryptor_system_nss.cc',
             'browser/importer/nss_decryptor_system_nss.h',
           ]
         }],
         ['enable_app_list==1', {
           'dependencies': [
             '../ui/app_list/app_list.gyp:app_list',
           ]
         }],
+        ['enable_message_center==1', {
+          'dependencies': [
+            '../ui/message_center/message_center.gyp:message_center',
+          ],
+        }, {  # enable_message_center==0
+          'sources!': [
+            'browser/notifications/message_center_notification_manager.cc',
+            'browser/notifications/message_center_notification_manager.h',
+          ],
+        }],
       ],
       'target_conditions': [
         # Need 'target_conditions' to override default filename_rules to include
         # the files on Android.
         ['OS=="android"', {
           'sources/': [
             ['include', '^app/breakpad_linux\\.cc$'],
             ['include', '^browser/crash_handler_host_linux\\.cc$'],
             ['include', '^browser/crash_handler_host_linux_stub\\.cc$'],
           ],
@@ skipping 122 matching lines @@
           'variables': {
             'jni_gen_dir': 'chrome',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
      },
     ],
   ],
 }