Remove unused code and ipc_handle_win.(h|cc).

ipc/BUILD.gn

 # 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.
 
 import("//build/config/nacl/config.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 component("ipc") {
@@ skipping 37 matching lines @@
     "ipc_channel_proxy.cc",
     "ipc_channel_proxy.h",
     "ipc_channel_reader.cc",
     "ipc_channel_reader.h",
     "ipc_channel_win.cc",
     "ipc_channel_win.h",
     "ipc_descriptors.h",
     "ipc_endpoint.cc",
     "ipc_endpoint.h",
     "ipc_export.h",
-    "ipc_handle_win.cc",
-    "ipc_handle_win.h",
     "ipc_listener.h",
     "ipc_logging.cc",
     "ipc_logging.h",
     "ipc_message.cc",
     "ipc_message.h",
     "ipc_message_attachment.cc",
     "ipc_message_attachment.h",
     "ipc_message_attachment_set.cc",
     "ipc_message_attachment_set.h",
     "ipc_message_generator.cc",
@@ skipping 233 matching lines @@
     public_deps = [
       ":ipc",
     ]
     deps = [
       "//base",
       "//base/test:test_support",
       "//testing/gtest",
     ]
   }
 }