Delete the GTK+ port of Chrome.

ui/base/ui_base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 25 matching lines @@
       'sources' : [
         'accelerators/accelerator.cc',
         'accelerators/accelerator.h',
         'accelerators/accelerator_manager.cc',
         'accelerators/accelerator_manager.h',
         'accelerators/menu_label_accelerator_util_linux.cc',
         'accelerators/menu_label_accelerator_util_linux.h',
         'accelerators/platform_accelerator.h',
         'accelerators/platform_accelerator_cocoa.h',
         'accelerators/platform_accelerator_cocoa.mm',
-        'accelerators/platform_accelerator_gtk.cc',
-        'accelerators/platform_accelerator_gtk.h',
         'android/ui_base_jni_registrar.cc',
         'android/ui_base_jni_registrar.h',
         'android/view_android.cc',
         'android/view_android.h',
         'android/window_android.cc',
         'android/window_android.h',
         'android/window_android_compositor.h',
         'android/window_android_observer.h',
         'base_window.cc',
         'base_window.h',
         'clipboard/clipboard.cc',
         'clipboard/clipboard.h',
         'clipboard/clipboard_android.cc',
         'clipboard/clipboard_android_initialization.h',
         'clipboard/clipboard_aura.cc',
         'clipboard/clipboard_aurax11.cc',
         'clipboard/clipboard_constants.cc',
-        'clipboard/clipboard_gtk.cc',
         'clipboard/clipboard_mac.mm',
         'clipboard/clipboard_types.h',
         'clipboard/clipboard_util_win.cc',
         'clipboard/clipboard_util_win.h',
         'clipboard/clipboard_win.cc',
         'clipboard/custom_data_helper.cc',
         'clipboard/custom_data_helper.h',
         'clipboard/custom_data_helper_linux.cc',
         'clipboard/custom_data_helper_mac.mm',
         'clipboard/scoped_clipboard_writer.cc',
@@ skipping 89 matching lines @@
         'dragdrop/gtk_dnd_util.cc',
         'dragdrop/gtk_dnd_util.h',
         'dragdrop/os_exchange_data.cc',
         'dragdrop/os_exchange_data.h',
         'dragdrop/os_exchange_data_provider_aura.cc',
         'dragdrop/os_exchange_data_provider_aura.h',
         'dragdrop/os_exchange_data_provider_aurax11.cc',
         'dragdrop/os_exchange_data_provider_aurax11.h',
         'dragdrop/os_exchange_data_provider_win.cc',
         'dragdrop/os_exchange_data_provider_win.h',
-        'gtk/event_synthesis_gtk.cc',
-        'gtk/event_synthesis_gtk.h',
-        'gtk/focus_store_gtk.cc',
-        'gtk/focus_store_gtk.h',
-        'gtk/g_object_destructor_filo.cc',
-        'gtk/g_object_destructor_filo.h',
-        'gtk/gtk_expanded_container.cc',
-        'gtk/gtk_expanded_container.h',
-        'gtk/gtk_floating_container.cc',
-        'gtk/gtk_floating_container.h',
-        'gtk/gtk_hig_constants.h',
-        'gtk/gtk_screen_util.cc',
-        'gtk/gtk_screen_util.h',
-        'gtk/gtk_signal.h',
-        'gtk/gtk_signal_registrar.cc',
-        'gtk/gtk_signal_registrar.h',
-        'gtk/gtk_windowing.cc',
-        'gtk/gtk_windowing.h',
-        'gtk/owned_widget_gtk.cc',
-        'gtk/owned_widget_gtk.h',
-        'gtk/scoped_region.cc',
-        'gtk/scoped_region.h',
         'hit_test.h',
         'l10n/formatter.cc',
         'l10n/formatter.h',
         'l10n/l10n_font_util.cc',
         'l10n/l10n_font_util.h',
         'l10n/l10n_util.cc',
         'l10n/l10n_util.h',
         'l10n/l10n_util_android.cc',
         'l10n/l10n_util_android.h',
         'l10n/l10n_util_collator.h',
@@ skipping 34 matching lines @@
         'models/tree_node_iterator.h',
         'models/tree_node_model.h',
         'nine_image_painter_factory.cc',
         'nine_image_painter_factory.h',
         'resource/data_pack.cc',
         'resource/data_pack.h',
         'resource/resource_bundle.cc',
         'resource/resource_bundle.h',
         'resource/resource_bundle_android.cc',
         'resource/resource_bundle_auralinux.cc',
-        'resource/resource_bundle_gtk.cc',
         'resource/resource_bundle_ios.mm',
         'resource/resource_bundle_mac.mm',
         'resource/resource_bundle_win.cc',
         'resource/resource_bundle_win.h',
         'resource/resource_data_dll_win.cc',
         'resource/resource_data_dll_win.h',
         'resource/resource_handle.h',
         'text/bytes_formatting.cc',
         'text/bytes_formatting.h',
         'theme_provider.cc',
@@ skipping 363 matching lines @@
            'variables': {
              'jni_gen_package': 'ui',
              'jni_generator_ptr_type': 'long',
            },
            'includes': [ '../../build/jni_generator.gypi' ],
          },
        ],
     }],
   ],
 }