Delete the GTK+ port of Chrome.

ui/ui_unittests.gyp

 # Copyright 2013 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': 'ui_test_support',
       'dependencies': [
         '../base/base.gyp:base',
         '../skia/skia.gyp:skia',
         '../testing/gtest.gyp:gtest',
         'gfx/gfx.gyp:gfx',
         'gfx/gfx.gyp:gfx_geometry',
       ],
       'sources': [
         'base/test/ui_controls.h',
         'base/test/ui_controls_aura.cc',
-        'base/test/ui_controls_gtk.cc',
         'base/test/ui_controls_internal_win.cc',
         'base/test/ui_controls_internal_win.h',
         'base/test/ui_controls_mac.mm',
         'base/test/ui_controls_win.cc',
       ],
       'include_dirs': [
         '../',
       ],
       'conditions': [
         ['OS!="ios"', {
@@ skipping 324 matching lines @@
           'variables': {
             'test_suite_name': 'ui_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)ui_unittests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }