Content shell/GTK: Add JavaScript dialog support.

content/content_shell.gypi

 # Copyright (c) 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.
 
 {
   'variables': {
     'content_shell_product_name': 'Content Shell',
   },
   'targets': [
     {
@@ skipping 62 matching lines @@
         'shell/shell_content_client.cc',
         'shell/shell_content_client.h',
         'shell/shell_content_renderer_client.cc',
         'shell/shell_content_renderer_client.h',
         'shell/shell_devtools_delegate.cc',
         'shell/shell_devtools_delegate.h',
         'shell/shell_download_manager_delegate.cc',
         'shell/shell_download_manager_delegate.h',
         'shell/shell_javascript_dialog_creator.cc',
         'shell/shell_javascript_dialog_creator.h',
+        'shell/shell_javascript_dialog_gtk.cc',
         'shell/shell_javascript_dialog_mac.mm',
         'shell/shell_javascript_dialog_win.cc',
         'shell/shell_javascript_dialog.h',
         'shell/shell_login_dialog_mac.mm',
         'shell/shell_login_dialog.cc',
         'shell/shell_login_dialog.h',
         'shell/shell_main_delegate.cc',
         'shell/shell_main_delegate.h',
         'shell/shell_messages.cc',
         'shell/shell_messages.h',
@@ skipping 553 matching lines @@
                 'shell/android/java/content_shell_apk.xml',
                 # '<(CONFIGURATION_NAME)',
               ]
             }
           ],
         },
       ],
     }],  # OS=="android"
   ]
 }