Merge the two buffer list implementations

runtime/bin/bin.gypi

 # Copyright (c) 2011, 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.
 
 {
   'variables': {
     'builtin_in_cc_file': 'builtin_in.cc',
     'builtin_cc_file': '<(SHARED_INTERMEDIATE_DIR)/builtin_gen.cc',
     'snapshot_in_cc_file': 'snapshot_in.cc',
     'snapshot_bin_file': '<(SHARED_INTERMEDIATE_DIR)/snapshot_gen.bin',
     'snapshot_cc_file': '<(SHARED_INTERMEDIATE_DIR)/snapshot_gen.cc',
   },
   'targets': [
     {
       'target_name': 'generate_builtin_cc_file',
       'type': 'none',
       'conditions': [
         ['OS=="win"', {
           'msvs_cygwin_dirs': ['<(DEPTH)/../third_party/cygwin'],
         }],
       ],
       'sources': [
         'builtin.dart',
+        'buffer_list.dart',
         'directory.dart',
         'directory_impl.dart',
         'eventhandler.dart',
         'file.dart',
         'file_impl.dart',
         'input_stream.dart',
         'output_stream.dart',
         'string_stream.dart',
         'platform.dart',
         'platform_impl.dart',
@@ skipping 384 matching lines @@
         ]}],
         ['OS=="win"', {
           'link_settings': {
             'libraries': [ '-lws2_32.lib', '-lRpcrt4.lib' ],
           },
         }],
       ],
     },
   ],
 }