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

content/content_browser.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../device/vibration/vibration.gyp:device_vibration',
     '../device/vibration/vibration.gyp:device_vibration_mojo_bindings',
@@ skipping 1793 matching lines @@
       ],
     }],
     ['OS=="linux" and use_aura==1', {
       'dependencies': [
         '../build/linux/system.gyp:fontconfig',
       ],
     }],
     ['use_x11==1', {
       'dependencies': [
         '../build/linux/system.gyp:x11',
+        '../ui/events/platform/x11/x11_events_platform.gyp:x11_events_platform',
+        '../ui/gfx/x/gfx_x11.gyp:gfx_x11',
       ],
     }],
     ['use_pango==1', {
       'dependencies': [
         '../build/linux/system.gyp:pangocairo',
       ],
       'sources!': [
         'browser/renderer_host/pepper/pepper_truetype_font_list_ozone.cc',
       ],
     }],
@@ skipping 127 matching lines @@
       'sources': [
         'browser/media/cdm/browser_cdm_manager.cc',
         'browser/media/cdm/browser_cdm_manager.h',
         # This works on Android because enable_browser_cdms==1 on Android.
         'browser/media/media_web_contents_observer.cc',
         'browser/media/media_web_contents_observer.h',
       ],
     }],
   ],
 }