Rename libchrome_zip to libzip_dart in build.

runtime/bin/zlib.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file is a modified copy of
 # https://chromium.googlesource.com/chromium/src/third_party/zlib/zlib.gyp
@@ skipping 46 matching lines @@
         '<(zlib_path)/zutil.h',
       ],
       'include_dirs': [
             '<(zlib_path)/.',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
               '<(zlib_path)/.',
         ],
       },
-      'conditions': [
-        ['OS!="win"', {
-          'product_name': 'chrome_zlib',
-        }],
-      ],
     },
   ],
 }