Update CRD ChromeOS Host build files to be better in line with GN style.

build/config/linux/gtk/BUILD.gn

 # Copyright 2016 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/gtk/gtk.gni")
 import("//build/config/linux/pkg_config.gni")
 
 assert(is_linux, "This file should only be referenced on Linux")
 
 # The target in this file will automatically reference GTK2 or GTK3 depending
 # on the state of the build flag. Some builds reference both 2 and 3, and some
 # builds reference neither, so both need to be available but in different
 # directories so pkg-config is only run when necessary.
 
 # Basically no parts of Chrome should depend on GTK. To prevent accidents, the
 # parts that explicitly need GTK are whitelisted on this target.
 group("gtk") {
   visibility = [
     "//chrome/test:interactive_ui_tests",
     "//gpu/gles2_conform_support:gles2_conform_test_windowless",
     "//remoting/host",
+    "//remoting/host/linux",
     "//remoting/host/it2me:common",
     "//remoting/host/it2me:remote_assistance_host",
     "//remoting/host:remoting_me2me_host_static",
     "//remoting/test:it2me_standalone_host_main",
     "//webrtc/examples:peerconnection_client",
   ]
 
   if (use_gtk3) {
     public_deps = [
       "//build/config/linux/gtk3",
     ]
   } else {
     public_deps = [
       "//build/config/linux/gtk2",
     ]
   }
 }