Use sysroot for dpkg-shlibdeps when building debian package

chrome/installer/linux/BUILD.gn

 # Copyright 2015 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/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
+import("//build/config/sysroot.gni")
 import("//build/util/process_version.gni")
 import("//build/util/version.gni")
 import("//chrome/process_version_rc_template.gni")  # For branding_file_path.
 
 if (current_cpu == "x86" || current_cpu == "x64") {
   import("//media/cdm/ppapi/cdm_paths.gni")
 }
 
 assert(is_linux)
 
@@ skipping 255 matching lines @@
       "-o",
       rebase_path(root_out_dir, root_build_dir),
       "-b",
       rebase_path(root_out_dir, root_build_dir),
       "-a",
       build_script_arch,
       "-c",
       invoker.channel,
       "-d",
       branding_path_component,
+      "-s",
+      rebase_path(sysroot),
     ]
     deps = [
       ":installer_deps",
     ]
   }
 
   if (!is_chromeos) {
     rpm_target_name = "${target_name}_rpm"
     action(rpm_target_name) {
       visibility = [ ":*" ]
@@ skipping 58 matching lines @@
 # Other packages that we support that aren't included in the default "linux"
 # target.
 linux_package("trunk") {
   channel = "trunk"
 }
 if (is_asan) {
   linux_package("asan") {
     channel = "asan"
   }
 }