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

Review-Url: https://codereview.chromium.org/2438773003
Cr-Original-Commit-Position: refs/heads/master@{#467017}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 295ec60d1934341a35781704a0301fdb3cca43a3

config/linux/gtk/BUILD.gn

@@ -19,6 +19,7 @@ group("gtk") {
     "//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",