Consolidate javascript_dialog_manager.h and javascript_dialog_manager_impl.h

components/app_modal_dialogs.gypi

 # 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.
 {
   'targets': [
     {
       'target_name': 'app_modal_dialogs',
       'type': 'static_library',
       'dependencies': [
         '../content/content.gyp:content_browser',
         '../content/content.gyp:content_common',
         '../skia/skia.gyp:skia',
         'components_strings.gyp:components_strings',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'app_modal_dialogs/app_modal_dialog.cc',
         'app_modal_dialogs/app_modal_dialog.h',
         'app_modal_dialogs/app_modal_dialog_queue.cc',
         'app_modal_dialogs/app_modal_dialog_queue.h',
         'app_modal_dialogs/app_modal_dialog_test_util.h',
         'app_modal_dialogs/javascript_app_modal_dialog.cc',
         'app_modal_dialogs/javascript_app_modal_dialog.h',
         'app_modal_dialogs/javascript_dialog_extensions_client.h',
         'app_modal_dialogs/javascript_dialog_manager.cc',
         'app_modal_dialogs/javascript_dialog_manager.h',
-        'app_modal_dialogs/javascript_dialog_manager_impl.cc',
-        'app_modal_dialogs/javascript_dialog_manager_impl.h',
         'app_modal_dialogs/javascript_native_dialog_factory.h',
         'app_modal_dialogs/native_app_modal_dialog.h'
       ],
       'conditions': [
         ['use_aura==1',{
           'dependencies': [
             '../ui/aura/aura.gyp:aura',
           ],
         }],
         ['toolkit_views==1 and OS!="mac"', {
           'sources': [
             'app_modal_dialogs/views/javascript_app_modal_dialog_views.h',
             'app_modal_dialogs/views/javascript_app_modal_dialog_views.cc',
           ],
         }],
       ],
     },
   ],
 }