Delete the GTK+ port of Chrome.

content/content_renderer.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.
 
 {
   'dependencies': [
     'content_common_mojo_bindings',
     '../gin/gin.gyp:gin',
     '../jingle/jingle.gyp:jingle_glue',
     '../media/media.gyp:media',
@@ skipping 543 matching lines @@
         'renderer/notification_provider.cc',
         'renderer/active_notification_tracker.cc',
       ],
     }],
     ['input_speech==0', {
       'sources!': [
         'renderer/input_tag_speech_dispatcher.cc',
         'renderer/input_tag_speech_dispatcher.h',
       ]
     }],
-    ['toolkit_uses_gtk == 1', {
-      'dependencies': [
-        '../build/linux/system.gyp:gtk',
-      ],
-    }],
     ['OS=="mac"', {
       'sources!': [
         'common/process_watcher_posix.cc',
         'renderer/webscrollbarbehavior_impl_gtkoraura.cc',
         'renderer/webscrollbarbehavior_impl_gtkoraura.h',
       ],
       'sources': [
         'renderer/external_popup_menu.cc',
         'renderer/external_popup_menu.h',
       ],
@@ skipping 204 matching lines @@
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }