[net] Remove logic for fixing up Gzip encoding type for downloads.

net/base/filename_util_internal.h

 // Copyright 2014 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.
 
-// Functions used internally by filename_util, filename_util_icu and
-// filename_util_unsafe.
+// Functions used internally by filename_util, and filename_util_icu.
 
 #ifndef NET_BASE_FILENAME_UTIL_INTERNAL_H_
 #define NET_BASE_FILENAME_UTIL_INTERNAL_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/strings/string16.h"
 
@@ skipping 36 matching lines @@
     const std::string& content_disposition,
     const std::string& referrer_charset,
     const std::string& suggested_name,
     const std::string& mime_type,
     const std::string& default_name,
     ReplaceIllegalCharactersCallback replace_illegal_characters_callback);
 
 }  // namespace net
 
 #endif  // NET_BASE_FILENAME_UTIL_INTERNAL_H_