Delete v8_shell target now that chrome uses d8

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 1106 matching lines @@
         }, {
           'toolsets': ['target'],
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
-    {
-      'target_name': 'v8_shell',
-      'type': 'executable',
-      'dependencies': [
-        'v8'
-      ],
-      'sources': [
-        '../../samples/shell.cc',
-      ],
-      'conditions': [
-        ['want_separate_host_toolset==1', {
-          'toolsets': ['host'],
-        }, {
-          'toolsets': ['target'],
-        }],
-        ['OS=="win"', {
-          # This could be gotten by not setting chromium_code, if that's OK.
-          'defines': ['_CRT_SECURE_NO_WARNINGS'],
-        }],
-        ['v8_compress_startup_data=="bz2"', {
-          'libraries': [
-            '-lbz2',
-          ]
-        }],
-      ],
-    },
   ],
 }