Speed up sanitizing headers received from HTTP proxies.

net/http/http_response_headers.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 #define NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 70 matching lines @@
   // Appends a representation of this object to the given pickle.
   // The options argument can be a combination of PersistOptions.
   void Persist(base::Pickle* pickle, PersistOptions options);
 
   // Performs header merging as described in 13.5.3 of RFC 2616.
   void Update(const HttpResponseHeaders& new_headers);
 
   // Removes all instances of a particular header.
   void RemoveHeader(const std::string& name);
 
+  // Removes all instances of particular headers.
+  void RemoveHeaders(const std::unordered_set<std::string>& header_names);
+
   // Removes a particular header line. The header name is compared
   // case-insensitively.
   void RemoveHeaderLine(const std::string& name, const std::string& value);
 
   // Adds a particular header.  |header| has to be a single header without any
   // EOL termination, just [<header-name>: <header-values>]
   // If a header with the same name is already stored, the two headers are not
   // merged together by this method; the one provided is simply put at the
   // end of the list.
   void AddHeader(const std::string& header);
@@ skipping 327 matching lines @@
 
   // The normalized http version (consistent with what GetStatusLine() returns).
   HttpVersion http_version_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpResponseHeaders);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_RESPONSE_HEADERS_H_