Move JavaScriptDialogManager, JavascriptAppModalDialogViews to components/app_modal_dialogs

extensions/components/extensions_components.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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
   },
+  'includes': [
+    'javascript_dialog_extensions_client.gypi',
+  ],
   'conditions': [
     ['toolkit_views==1', {
       'includes': [
         'native_app_window.gypi',
       ],
     }],
   ],
 }