Move i18n extension's date-format C++ code to runtime

tools/gyp/v8.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 805 matching lines @@
             'V8_SHARED',
           ],
         }],
         ['v8_postmortem_support=="true"', {
           'sources': [
             '<(SHARED_INTERMEDIATE_DIR)/debug-support.cc',
           ]
         }],
         ['v8_enable_i18n_support==1', {
           'sources': [
+            '../../src/i18n.cc',
+            '../../src/i18n.h',
             '../../src/extensions/i18n/break-iterator.cc',
             '../../src/extensions/i18n/break-iterator.h',
             '../../src/extensions/i18n/collator.cc',
             '../../src/extensions/i18n/collator.h',
-            '../../src/extensions/i18n/date-format.cc',
-            '../../src/extensions/i18n/date-format.h',
             '../../src/extensions/i18n/i18n-extension.cc',
             '../../src/extensions/i18n/i18n-extension.h',
             '../../src/extensions/i18n/i18n-utils.cc',
             '../../src/extensions/i18n/i18n-utils.h',
             '../../src/extensions/i18n/number-format.cc',
             '../../src/extensions/i18n/number-format.h',
           ],
           'dependencies': [
             '<(DEPTH)/third_party/icu/icu.gyp:icui18n',
             '<(DEPTH)/third_party/icu/icu.gyp:icuuc',
@@ skipping 194 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }