Hide X11 dependencies when use_x11=0.

chrome/chrome_exe.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.
 
 {
   'targets': [
     {
       'target_name': 'chrome',
       'type': 'none',
       'dependencies': [ 'chrome_initial', ],
@@ skipping 183 matching lines @@
                 'installer_util',
               ],
             }, { # else toolkit_uses_gtk == 1
               'dependencies': [
                 # On Linux, link the dependencies (libraries) that make up actual
                 # Chromium functionality directly into the executable.
                 '<@(chromium_browser_dependencies)',
                 '<@(chromium_child_dependencies)',
                 '../content/content.gyp:content_app_both',
                 # Needed for chrome_main.cc initialization of libraries.
-                '../build/linux/system.gyp:x11',
                 '../build/linux/system.gyp:pangocairo',
-                '../build/linux/system.gyp:xext',
                 # Needed to use the master_preferences functions
                 'installer_util',
               ],
             }],
+            # x11 build. Needed for chrome_main.cc initialization of libraries.
+            ['use_x11==1', {
+              'dependencies': [
+                '../build/linux/system.gyp:x11',
+                '../build/linux/system.gyp:xext',
+              ],
+            }],
           ],
           'sources': [
             'app/chrome_dll_resource.h',
             'app/chrome_main.cc',
             'app/chrome_main_delegate.cc',
             'app/chrome_main_delegate.h',
           ],
         }],
         ['OS=="mac"', {
           # 'branding' is a variable defined in common.gypi
@@ skipping 472 matching lines @@
               'dependencies': [
                 'chrome_nacl_win64',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }