Add content_common dependency to app_shim target

apps/app_shim/app_shim.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'app_shim',
       'type': 'static_library',
       # Since app_shim and browser depend on each other, we omit the dependency
       # on browser here.
       'dependencies': [
         '../chrome/chrome_resources.gyp:chrome_strings',
+        '../content/content.gyp:content_common',
         '../skia/skia.gyp:skia',
       ],
       'include_dirs': [
         '<(INTERMEDIATE_DIR)',
         '<(grit_out_dir)',
       ],
       'sources': [
         'app_shim_handler_mac.cc',
         'app_shim_handler_mac.h',
         'app_shim_host_mac.cc',
         'app_shim_host_mac.h',
         'app_shim_host_manager_mac.h',
         'app_shim_host_manager_mac.mm',
         'chrome_main_app_mode_mac.mm',
         'extension_app_shim_handler_mac.cc',
         'extension_app_shim_handler_mac.h',
       ],
     },
   ],  # targets
 }