Remove orphaned file src/shell.h

tools/gyp/v8.gyp

 # Copyright 2011 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 626 matching lines @@
             '../../src/scanner-base.cc',
             '../../src/scanner-base.h',
             '../../src/scanner.cc',
             '../../src/scanner.h',
             '../../src/scopeinfo.cc',
             '../../src/scopeinfo.h',
             '../../src/scopes.cc',
             '../../src/scopes.h',
             '../../src/serialize.cc',
             '../../src/serialize.h',
-            '../../src/shell.h',
             '../../src/small-pointer-list.h',
             '../../src/smart-pointer.h',
             '../../src/snapshot-common.cc',
             '../../src/snapshot.h',
             '../../src/spaces-inl.h',
             '../../src/spaces.cc',
             '../../src/spaces.h',
             '../../src/string-search.cc',
             '../../src/string-search.h',
             '../../src/string-stream.cc',
@@ skipping 402 matching lines @@
             }],
           ],
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }