Clean up incorrect V8_DEPRECATION macro usage and enable deprecatitions

samples/samples.gyp

 # Copyright 2012 the V8 project authors. 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
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 21 matching lines @@
   },
   'includes': ['../build/toolchain.gypi', '../build/features.gypi'],
   'target_defaults': {
     'type': 'executable',
     'dependencies': [
       '../tools/gyp/v8.gyp:v8',
     ],
     'include_dirs': [
       '../include',
     ],
+    'variables': {
+      # TODO(jochen): enable warnings.
+      'v8_deprecation_warnings': 0,
+    },
     'conditions': [
       ['v8_enable_i18n_support==1', {
         'dependencies': [
           '<(icu_gyp_path):icui18n',
           '<(icu_gyp_path):icuuc',
         ],
       }],
       ['OS=="win" and v8_enable_i18n_support==1', {
         'dependencies': [
           '<(icu_gyp_path):icudata',
@@ skipping 15 matching lines @@
       ],
     },
     {
       'target_name': 'lineprocessor',
       'sources': [
         'lineprocessor.cc',
       ],
     }
   ],
 }