Disk Cache: Use the old WorkerPool for Async IO on iOS.

net/net.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     'linux_link_kerberos%': 0,
     'use_tracing_cache_backend%': 0,
@@ skipping 362 matching lines @@
         'disk_cache/disk_format_base.h',
         'disk_cache/entry_impl.cc',
         'disk_cache/entry_impl.h',
         'disk_cache/errors.h',
         'disk_cache/eviction.cc',
         'disk_cache/eviction.h',
         'disk_cache/experiments.h',
         'disk_cache/file.cc',
         'disk_cache/file.h',
         'disk_cache/file_block.h',
+        'disk_cache/file_ios.cc',
         'disk_cache/file_lock.cc',
         'disk_cache/file_lock.h',
         'disk_cache/file_posix.cc',
         'disk_cache/file_win.cc',
         'disk_cache/histogram_macros.h',
         'disk_cache/in_flight_backend_io.cc',
         'disk_cache/in_flight_backend_io.h',
         'disk_cache/in_flight_io.cc',
         'disk_cache/in_flight_io.h',
         'disk_cache/mapped_file.cc',
@@ skipping 2700 matching lines @@
             'net_unittests.isolate',
           ],
           'sources': [
             'net_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }