Fix the linux shared build for common_constants....

chrome/chrome.gyp

 # Copyright (c) 2009 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,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
@@ skipping 381 matching lines @@
           ],
         }],
       ],
     },
      {
       'target_name': 'common_constants',
       'type': '<(library)',
       'dependencies': [
         '../base/base.gyp:base',
       ],
+      'conditions': [
+        ['OS=="linux"', {
+          'dependencies': ['../build/linux/system.gyp:gtk'],
+        }],
+      ],
       'sources': [
         'common/chrome_constants.cc',
         'common/chrome_constants.h',
         'common/chrome_paths.cc',
         'common/chrome_paths.h',
         'common/chrome_paths_internal.h',
         'common/chrome_paths_linux.cc',
         'common/chrome_paths_mac.mm',
         'common/chrome_paths_win.cc',
         'common/chrome_switches.cc',
@@ skipping 6254 matching lines @@
               'defines': [
                 'POSIX',
               ],
             }],
           ],
         },
       ],  # targets when chrome_personalization==1 and use_syncapi_stub==0
     }],
   ],  # 'conditions'
 }