Use gyp targets to link in X11 libraries instead of setting -lXfoo

chromeos/chromeos.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,
   },
   'includes': [
     'chromeos_memory.gypi',
@@ skipping 327 matching lines @@
         'system/name_value_pairs_parser.h',
         'system/statistics_provider.cc',
         'system/statistics_provider.h',
         'tpm_token_loader.cc',
         'tpm_token_loader.h'
       ],
       'conditions': [
         ['use_x11 == 1', {
           'dependencies': [
             '../build/linux/system.gyp:glib',
+            '../build/linux/system.gyp:x11',
+            '../build/linux/system.gyp:xext',
+            '../build/linux/system.gyp:xi',
+            '../build/linux/system.gyp:xrandr',
           ],
-          'link_settings': {
-            'libraries': [
-              '-lX11',
-              '-lXext',
-              '-lXi',
-              '-lXrandr',
-            ],
-          },
         }, {
           # use_x11 == 0
           'sources!': [
             'ime/xkeyboard.cc',
             'ime/xkeyboard.h',
             'display/output_configurator.cc',
             'display/output_configurator.h',
             'display/output_util.cc',
             'display/output_util.h',
             'display/real_output_configurator_delegate.cc',
@@ skipping 183 matching lines @@
         '../third_party/cros_system_api/dbus/power_manager/suspend.proto',
       ],
       'variables': {
         'proto_in_dir': '../third_party/cros_system_api/dbus/power_manager',
         'proto_out_dir': 'chromeos/dbus/power_manager',
       },
       'includes': ['../build/protoc.gypi'],
     },
   ],
 }