Clean up GTK3 build flags.

remoting/host/BUILD.gn

 # Copyright 2014 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/util/process_version.gni")
 import("//remoting/build/config/remoting_build.gni")
 
 group("all_tests") {
   testonly = true
 
@@ skipping 320 matching lines @@
   if (is_linux && !is_chromeos) {
     libs += [ "pam" ]
   }
 
   if (use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xrandr",
     ]
     if (is_desktop_linux) {
-      if (use_gtk3) {
-        deps += [ "//build/config/linux/gtk3" ]
-      } else {
-        deps += [ "//build/config/linux/gtk2" ]
-      }
+      deps += [ "//build/config/linux/gtk" ]
     }
   } else {
     sources -= [
       "clipboard_x11.cc",
       "desktop_resizer_x11.cc",
       "input_injector_x11.cc",
       "local_input_monitor_x11.cc",
     ]
     if (is_linux) {
       # These will already be filtered out on non-Linux.
@@ skipping 389 matching lines @@
 
     if (enable_webrtc) {
       deps += [
         "//third_party/libjingle/webrtc:libjingle_webrtc",
         "//third_party/webrtc/libjingle/xmllite",
         "//third_party/webrtc/libjingle/xmpp",
       ]
     }
 
     if (is_desktop_linux) {
-      if (use_gtk3) {
-        deps += [ "//build/config/linux/gtk3" ]
-      } else {
-        deps += [ "//build/config/linux/gtk2" ]
-      }
+      deps += [ "//build/config/linux/gtk" ]
     }
     if ((is_linux && !is_chromeos) || is_mac) {
       libs = [ "pam" ]
     }
 
     if (is_mac && is_official_build) {
       sources += [ "internal/internal_mac-inl.h" ]
     }
 
     if (remoting_multi_process != 0) {
@@ skipping 74 matching lines @@
     group("remoting_me2me_host_archive") {
       deps = [
         "//remoting/host/installer/mac:remoting_me2me_host_archive",
       ]
     }
   } else {
     group("remoting_me2me_host_archive") {
     }
   }
 }