Clean up incorrect V8_DEPRECATION macro usage and enable deprecatitions

src/d8.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 15 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
   'variables': {
     'v8_code': 1,
     'console%': '',
     # Enable support for Intel VTune. Supported on ia32/x64 only
     'v8_enable_vtunejit%': 0,
     'v8_enable_i18n_support%': 1,
   },
+  'target_defaults': {
+    'variables': {
+      # TODO(jochen): enable warnings.
+      'v8_deprecation_warnings': 0,
+    },
+  },
   'includes': ['../build/toolchain.gypi', '../build/features.gypi'],
   'targets': [
     {
       'target_name': 'd8',
       'type': 'executable',
       'dependencies': [
         '../tools/gyp/v8.gyp:v8',
       ],
       # Generated source files need this explicitly:
       'include_dirs+': [
@@ skipping 78 matching lines @@
             '<@(_outputs)',
             'D8',
             'off',  # compress startup data
             '<@(js_files)'
           ],
         },
       ],
     }
   ],
 }