Make the warning level consistent across the project

Source/bindings/derived_sources.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 182 matching lines @@
       }]
     },
     {
       'target_name': 'bindings_sources',
       'type': 'none',
       # The 'binding' rule generates .h files, so mark as hard_dependency, per:
       # https://code.google.com/p/gyp/wiki/InputFormatReference#Linking_Dependencies
       'hard_dependency': 1,
       'dependencies': [
         'interface_dependencies',
+        '../config.gyp:config',
         '../core/core_derived_sources.gyp:generate_test_support_idls',
       ],
       'sources': [
         '<@(main_idl_files)',
         '<@(support_idl_files)',
         '<@(generated_support_idl_files)',
       ],
       'rules': [{
         'rule_name': 'binding',
         'extension': 'idl',
@@ skipping 90 matching lines @@
           '../build/scripts/action_derivedsourcesallinone.py',
           '<(SHARED_INTERMEDIATE_DIR)/blink/BindingsDerivedSources.txt',
           '--',
           '<@(derived_sources_aggregate_files)',
         ],
         'message': 'Generating bindings derived sources',
       }],
     },
   ],
 }