Do not build unicode_to_keysym.cc when use_x11 == 0

remoting/remoting_host.gypi

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     'remoting_enable.gypi',
   ],
 
   'conditions': [
@@ skipping 50 matching lines @@
               'conditions': [
                 ['use_x11==1', {
                   'dependencies': [
                     '../build/linux/system.gyp:x11',
                     '../build/linux/system.gyp:xext',
                     '../build/linux/system.gyp:xfixes',
                     '../build/linux/system.gyp:xi',
                     '../build/linux/system.gyp:xrandr',
                     '../build/linux/system.gyp:xtst',
                   ],
+                }, {
+                'sources!' : [
+                  'host/linux/unicode_to_keysym.cc',
+                ],
                 }],
                 ['chromeos==0 and use_ozone==0', {
                   'dependencies': [
                     # use GTK on Linux, even for Aura builds.
                     '../build/linux/system.gyp:gtk2',
                   ],
                 }]
               ],
             }],
             ['chromeos==1', {
@@ skipping 644 matching lines @@
               # Dummy target for chromeos==1
               'target_name': 'remoting_it2me_native_messaging_host',
               'type': 'executable',
             },
           ],  # targets
         }],  # end of chromeos==0
       ],  # end of conditions
     }],  # end of OS!="win" and enable_remoting_host==1
   ],  # end of 'conditions'
 }