Remove net::Filter code

net/filter/brotli_filter.h

Index: net/filter/brotli_filter.h
diff --git a/net/filter/brotli_filter.h b/net/filter/brotli_filter.h
deleted file mode 100644
index 5570ae4320e06e9edad355e1cbb700ce9d4e31aa..0000000000000000000000000000000000000000
--- a/net/filter/brotli_filter.h
+++ /dev/null
@@ -1,17 +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.
-
-#ifndef NET_FILTER_BROTLI_FILTER_H_
-#define NET_FILTER_BROTLI_FILTER_H_
-
-#include "net/filter/filter.h"
-
-namespace net {
-
-// Creates instance of filter or returns nullptr if brotli is not supported.
-Filter* CreateBrotliFilter(Filter::FilterType type_id);
-
-}  // namespace net
-
-#endif  // NET_FILTER_BROTLI_FILTER_H__