Silence libtool warning when building libcrnet_standalone.a.

ios/crnet/crnet_pack.gyp

 # Copyright 2014 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': [],
   'conditions': [
@@ skipping 30 matching lines @@
           ],
           'actions': [
             {
               'action_name': 'Package CrNet',
               'variables': {
                 'tool_path':
                     '../../ios/build/packaging/link_dependencies.py',
               },
 
               # Actions need an inputs list, even if it's empty.
-              'inputs': [],
+              'inputs': [
+                '<(tool_path)',
+                '<(PRODUCT_DIR)/crnet_dummy.app/crnet_dummy',
+              ],
               # Only specify one output, since this will be libtool's output.
               'outputs': [ '<(PRODUCT_DIR)/libcrnet_standalone.a' ],
               'action': ['<(tool_path)',
                          '<(PRODUCT_DIR)',
                          'crnet_dummy.app/crnet_dummy',
                          '<@(_outputs)',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }