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

net/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//url/config.gni")
 
 # TODO(cjhopman): //build/config/android/rules.gni also imports grit_rule.gni.
@@ skipping 584 matching lines @@
 
 executable("dump_cache") {
   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",
   ]
 
   configs += [ ":net_win_size_truncation" ]
 
   deps = [
     "//base",
@@ skipping 748 matching lines @@
   sources = [ "quic/quic_server_bin.cc" ]
   deps = [
     ":quic_tools",
     ":net",
     "//base",
     "//third_party/boringssl",
   ]
 }
 
 }  # !is_android