fix content build on !linux && use_x11

content/content_common.gypi

 # Copyright (c) 2011 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',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../gpu/gpu.gyp:gpu_ipc',
     '../ipc/ipc.gyp:ipc',
@@ skipping 276 matching lines @@
     }],
     ['toolkit_uses_gtk == 1', {
       'dependencies': [
         '../build/linux/system.gyp:gtk',
       ],
     }],
     ['use_x11 == 1', {
       'dependencies': [
         '../build/linux/system.gyp:pangocairo',
       ],
-    }],
-    ['use_x11 == 1 and target_arch != "arm"', {
-      'sources': [
-        'common/gpu/x_util.cc',
-        'common/gpu/x_util.h',
-      ],
-    }],
-    ['OS=="linux"', {
       'include_dirs': [
         '<(DEPTH)/third_party/angle/include',
       ],
       'link_settings': {
         'libraries': [
           '-lXcomposite',
         ],
       },
     }],
+    ['use_x11 == 1 and target_arch != "arm"', {
+      'sources': [
+        'common/gpu/x_util.cc',
+        'common/gpu/x_util.h',
+      ],
+    }],
     ['enable_gpu==1', {
       'dependencies': [
         '../gpu/gpu.gyp:command_buffer_service',
       ],
     }],
     ['target_arch=="arm"', {
       'dependencies': [
         '../media/media.gyp:media',
       ],
       'sources': [
         'common/gpu/media/gles2_texture_to_egl_image_translator.cc',
         'common/gpu/media/gles2_texture_to_egl_image_translator.h',
         'common/gpu/media/omx_video_decode_accelerator.cc',
         'common/gpu/media/omx_video_decode_accelerator.h',
       ],
       'include_dirs': [
         '<(DEPTH)/third_party/angle/include',
         '<(DEPTH)/third_party/openmax/il',
       ],
       'link_settings': {
         'libraries': [
           '-lEGL',
           '-lGLESv2',
         ],
       },
     }],
   ],
 }