Delete the GTK+ port of Chrome.

ui/events/events.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': [
     {
@@ skipping 24 matching lines @@
         'event_constants.h',
         'event_switches.cc',
         'event_switches.h',
         'events_base_export.h',
         'gesture_event_details.cc',
         'gesture_event_details.h',
         'keycodes/keyboard_code_conversion.cc',
         'keycodes/keyboard_code_conversion.h',
         'keycodes/keyboard_code_conversion_android.cc',
         'keycodes/keyboard_code_conversion_android.h',
-        'keycodes/keyboard_code_conversion_gtk.cc',
-        'keycodes/keyboard_code_conversion_gtk.h',
         'keycodes/keyboard_code_conversion_mac.h',
         'keycodes/keyboard_code_conversion_mac.mm',
         'keycodes/keyboard_code_conversion_win.cc',
         'keycodes/keyboard_code_conversion_win.h',
         'keycodes/keyboard_code_conversion_x.cc',
         'keycodes/keyboard_code_conversion_x.h',
         'keycodes/keyboard_codes.h',
         'latency_info.cc',
         'latency_info.h',
         'x/device_data_manager.cc',
@@ skipping 303 matching lines @@
           'variables': {
             'test_suite_name': 'events_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)events_unittests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }