Move app_installer into chromium.

third_party/omaha/omaha.gyp

 # Copyright 2014 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,
-  },
   'targets': [
     {
-      'target_name': 'device_core',
+      'target_name': 'omaha_extractor',
       'type': 'static_library',
+      'sources': [
+        'src/omaha/base/extractor.cc',
+        'src/omaha/base/extractor.h',
+      ],
       'include_dirs': [
         '../..',
-      ],
-      'sources': [
-        'device_client.cc',
-        'device_client.h',
+        'src',
       ],
     },
   ],
 }