do not require xscrnsaver on CrOS

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 840 matching lines @@
         'browser/icon_loader_mac.mm',
         'browser/icon_loader_win.cc',
         'browser/icon_manager.cc',
         'browser/icon_manager.h',
         'browser/idle.cc',
         'browser/idle.h',
         'browser/idle_android.cc',
         'browser/idle_chromeos.cc',
         'browser/idle_linux.cc',
         'browser/idle_mac.mm',
-        'browser/idle_query_x11.cc',
-        'browser/idle_query_x11.h',
         'browser/idle_win.cc',
         'browser/image_decoder.cc',
         'browser/image_decoder.h',
         'browser/image_holder.cc',
         'browser/image_holder.h',
         'browser/importer/external_process_importer_client.cc',
         'browser/importer/external_process_importer_client.h',
         'browser/importer/external_process_importer_host.cc',
         'browser/importer/external_process_importer_host.h',
         'browser/importer/firefox_profile_lock.cc',
@@ skipping 2185 matching lines @@
                 '../win8/win8.gyp:metro_viewer',
               ],
             }],
           ],
         }],
         ['ui_compositor_image_transport==1', {
           'dependencies': [
             '../ui/gl/gl.gyp:gl',
           ],
         }],
-        ['use_x11==1', {
+        ['use_x11==1 and chromeos==0', {
+          'sources': [
+            'browser/idle_query_x11.cc',
+            'browser/idle_query_x11.h',
+          ],
           'dependencies': [
             '../build/linux/system.gyp:xscrnsaver',
           ],
         }],
         ['os_posix == 1 and OS != "mac" and OS != "ios"', {
           'sources': [
             'app/chrome_breakpad_client.cc',
             'app/chrome_breakpad_client.h',
           ],
           'dependencies': [
@@ skipping 659 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }