Do not build unicode_to_keysym.cc when use_x11 == 0

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/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/manifest.gni")
 import("//build/util/version.gni")
 import("//remoting/remoting_enable.gni")
 import("//remoting/remoting_locales.gni")
@@ skipping 122 matching lines @@
     } 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.
         sources -= [
+          "linux/unicode_to_keysym.cc",
           "linux/x11_util.cc",
           "linux/x_server_clipboard.cc",
           "linux/x_server_clipboard.h",
         ]
       }
     }
 
     if (!use_ozone) {
       sources -= [ "desktop_resizer_ozone.cc" ]
     }
@@ skipping 187 matching lines @@
       "setup/me2me_native_messaging_host_unittest.cc",
       "setup/oauth_helper_unittest.cc",
       "setup/pin_validator_unittest.cc",
       "third_party_auth_config_unittest.cc",
       "token_validator_factory_impl_unittest.cc",
       "touch_injector_win_unittest.cc",
       "win/rdp_client_unittest.cc",
       "win/worker_process_launcher_unittest.cc",
     ]
 
+    if (!use_x11 && is_linux) {
+      sources -= [ "linux/unicode_to_keysym_unittest.cc" ]
+    }
     if (use_ozone || is_chromeos) {
       sources -= [ "local_input_monitor_unittest.cc" ]
     }
     if (is_chromeos) {
       sources -= [ "linux/x_server_clipboard_unittest.cc" ]
     }
     if (is_android) {
       sources -= [ "it2me/it2me_native_messaging_host_unittest.cc" ]
     }
 
@@ skipping 796 matching lines @@
           "--target_arch",
           msi_script_arch,
           rebase_path("$root_out_dir/remoting-me2me-host-$current_os.zip",
                       root_build_dir),
           rebase_path(outputs[0], root_build_dir),
         ]
       }
     }
   }
 }