linux/gyp: Find missing symbols at build time, not runtime.

ui/events/events.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 125 matching lines @@
         'x/events_x.cc',
         'linux/text_edit_command_auralinux.cc',
         'linux/text_edit_command_auralinux.h',
         'linux/text_edit_key_bindings_delegate_auralinux.cc',
         'linux/text_edit_key_bindings_delegate_auralinux.h',
       ],
       'conditions': [
         ['use_x11==1', {
           'dependencies': [
             'devices/events_devices.gyp:events_devices',
+            '../gfx/x/gfx_x11.gyp:gfx_x11',
             '../../build/linux/system.gyp:x11',
           ],
         }],
         ['use_aura==0', {
           'sources!': [
             'gestures/gesture_provider_aura.cc',
             'gestures/gesture_provider_aura.h',
             'gestures/gesture_recognizer.h',
             'gestures/gesture_recognizer_impl.cc',
             'gestures/gesture_recognizer_impl.h',
@@ skipping 273 matching lines @@
               'dependencies': [
                 '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }