Work on GN build of Chrome.

chrome/browser/ui/libgtk2ui/libgtk2ui.gyp

 # 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
+      # GN version: //chrome/browser/ui/libgtk2ui
       'target_name': 'gtk2ui',
       'type': '<(component)',
       'dependencies': [
         '../../../../base/base.gyp:base',
         '../../../../base/base.gyp:base_i18n',
         '../../../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../../../build/linux/system.gyp:gconf',
         '../../../../build/linux/system.gyp:gtk',
         '../../../../build/linux/system.gyp:gtkprint',
         '../../../../components/components_resources.gyp:components_resources',
@@ skipping 10 matching lines @@
       ],
       'defines': [
         'LIBGTK2UI_IMPLEMENTATION',
       ],
       # Several of our source files are named _gtk2.cc. This isn't to
       # differentiate them from their source files (ninja and make are sane
       # build systems, unlike MSVS). It is instead to get around the rest of
       # the normal, global gtk exclusion rules, as we are otherwise using gtk
       # in a non-gtk build.
       'sources': [
+        # Note: sources list duplicated in GN build.
         'app_indicator_icon.cc',
         'app_indicator_icon.h',
         'app_indicator_icon_menu.cc',
         'app_indicator_icon_menu.h',
         'chrome_gtk_frame.cc',
         'chrome_gtk_frame.h',
         'chrome_gtk_menu_subclasses.cc',
         'chrome_gtk_menu_subclasses.h',
         'g_object_destructor_filo.cc',
         'g_object_destructor_filo.h',
@@ skipping 46 matching lines @@
           # G_DEFINE_TYPE automatically generates a *get_instance_private inline function after glib 2.37.
           # That's unused. Prevent to complain about it.
           'cflags': [
             '-Wno-unused-function',
           ],
         }],
       ],
     },
   ],
 }