Remove net::Filter code

net/filter/brotli_filter_disabled.cc

Index: net/filter/brotli_filter_disabled.cc
diff --git a/net/filter/brotli_filter_disabled.cc b/net/filter/brotli_filter_disabled.cc
deleted file mode 100644
index 1081ff4648135a4d523d009315fc909f885fe772..0000000000000000000000000000000000000000
--- a/net/filter/brotli_filter_disabled.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2015 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.
-
-#include "net/filter/brotli_filter.h"
-
-namespace net {
-
-Filter* CreateBrotliFilter(Filter::FilterType type_id) {
-  return nullptr;
-}
-
-}  // namespace net