Make extensions_utility target properly depend on extensions_strings

extensions/extensions.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 1032 matching lines @@
       'msvs_disabled_warnings': [ 4267, ],
     },
     {
       # GN version: //extensions/utility
       'target_name': 'extensions_utility',
       'type': 'static_library',
       'dependencies': [
         '../content/content.gyp:content_utility',
         '../third_party/zlib/google/zip.gyp:zip',
         'extensions_common',
+        'extensions_strings.gyp:extensions_strings',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'utility/unpacker.cc',
         'utility/unpacker.h',
         'utility/utility_handler.cc',
         'utility/utility_handler.h',
       ],
@@ skipping 111 matching lines @@
               '<(SHARED_INTERMEDIATE_DIR)/blink/devtools_resources.pak',
             ],
             'pak_output': '<(PRODUCT_DIR)/extensions_shell_and_test.pak',
           },
           'includes': [ '../build/repack_action.gypi' ],
         },
       ],
     },
   ]
 }