Remove unnecessary libXss dependency via //build/config/linux:x11

build/config/linux/BUILD.gn

 # 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.
 
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/features.gni")
 import("//build/config/sysroot.gni")
 import("//build/config/ui.gni")
 import("//tools/generate_library_loader/generate_library_loader.gni")
 
@@ skipping 50 matching lines @@
   pkg_config("libevdev-cros") {
     packages = [ "libevdev-cros" ]
   }
 
   pkg_config("libgestures") {
     packages = [ "libgestures" ]
   }
 }
 
 config("x11") {
-  # Don't bother running pkg-config for these X related libraries since it just
-  # returns the same libs, and forking pkg-config is slow.
   libs = [
     "X11",
     "Xcomposite",
     "Xcursor",
     "Xdamage",
     "Xext",
     "Xfixes",
     "Xi",
     "Xrender",
-    "Xss",
     "Xtst",
   ]
 }
 
 config("xcomposite") {
   libs = [ "Xcomposite" ]
 }
 
 config("xext") {
   libs = [ "Xext" ]
@@ skipping 116 matching lines @@
     "pci_alloc",
     "pci_init",
     "pci_cleanup",
     "pci_scan_bus",
     "pci_fill_info",
     "pci_lookup_name",
   ]
 }
 
 # Looking for libspeechd? Use //third_party/speech-dispatcher