Remove disk_cache::BackendImpl::OpenPrevEntry() and all users.

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 1115 matching lines @@
         'net_test_support',
       ],
       'sources': [
         'tools/dump_cache/cache_dumper.cc',
         'tools/dump_cache/cache_dumper.h',
         'tools/dump_cache/dump_cache.cc',
         'tools/dump_cache/dump_files.cc',
         'tools/dump_cache/dump_files.h',
         'tools/dump_cache/simple_cache_dumper.cc',
         'tools/dump_cache/simple_cache_dumper.h',
-        'tools/dump_cache/upgrade_win.cc',
-        'tools/dump_cache/upgrade_win.h',
         'tools/dump_cache/url_to_filename_encoder.cc',
         'tools/dump_cache/url_to_filename_encoder.h',
         'tools/dump_cache/url_utilities.h',
         'tools/dump_cache/url_utilities.cc',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [4267, ],
     },
     {
       # This is a temporary target which will be merged into 'net' once the
@@ skipping 581 matching lines @@
             'net_unittests.isolate',
           ],
           'sources': [
             'net_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }