Remove net::Filter code

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 7a8233b9ccef837a726d489dd2d5c3debed99384..6ed970836b1703428d2ab7cdd08f7e4b3884e1c9 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -386,11 +386,9 @@ component("net") {
 
     # Brotli support.
     if (!disable_brotli_filter) {
-      sources += [ "filter/brotli_filter.cc" ]
       sources += [ "filter/brotli_source_stream.cc" ]
       deps += [ "//third_party/brotli" ]
     } else {
-      sources += [ "filter/brotli_filter_disabled.cc" ]
       sources += [ "filter/brotli_source_stream_disabled.cc" ]
     }
   }
@@ -1446,7 +1444,6 @@ test("net_unittests") {
       "disk_cache/blockfile/block_files_unittest.cc",
 
       # Need to read input data files.
-      "filter/gzip_filter_unittest.cc",
       "socket/ssl_server_socket_unittest.cc",
       "spdy/fuzzing/hpack_fuzz_util_test.cc",
 
@@ -1504,7 +1501,6 @@ test("net_unittests") {
 
   # Exclude brotli test if the support for brotli is disabled.
   if (disable_brotli_filter) {
-    sources -= [ "filter/brotli_filter_unittest.cc" ]
     sources -= [ "filter/brotli_source_stream_unittest.cc" ]
   }