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

chrome/chrome_common.gypi

 # Copyright (c) 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.
 
 {
   'targets': [
     {
       'target_name': 'common',
       'type': 'static_library',
       'variables': {
@@ skipping 477 matching lines @@
           ],
         }],
         ['enable_mdns == 1', {
             'sources': [
               'common/local_discovery/local_discovery_messages.h',
             ]
         }],
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
+            '../build/linux/system.gyp:x11',
+            '../build/linux/system.gyp:xrender',
+            '../build/linux/system.gyp:xext',
           ],
           'export_dependent_settings': [
             '../third_party/sqlite/sqlite.gyp:sqlite',
           ],
           'link_settings': {
             'libraries': [
-              '-lX11',
-              '-lXrender',
               '-lXss',
-              '-lXext',
             ],
           },
         }],
         ['chromeos==1', {
           'sources!': [
             'common/chrome_version_info_linux.cc',
           ],
         }],
         ['OS=="mac"', {
           'dependencies': [
@@ skipping 228 matching lines @@
         'common/metrics/proto/user_action_event.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/metrics/proto',
         'proto_out_dir': 'chrome/common/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }