Remove ForwardingMessageFilter.

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("//testing/test.gni")
 
 component("ipc") {
   sources = [
     "attachment_broker.h",
     "attachment_broker_messages.h",
@@ skipping 14 matching lines @@
     "ipc_channel_posix.cc",
     "ipc_channel_posix.h",
     "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_export.h",
-    "ipc_forwarding_message_filter.cc",
-    "ipc_forwarding_message_filter.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",
@@ skipping 150 matching lines @@
     "ipc_test_sink.cc",
     "ipc_test_sink.h",
   ]
   deps = [
     ":ipc",
     "//base",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }