Revert of Convert //net and //chromecast to std::unordered_*

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>
 
 #include <string>
-#include <unordered_set>
 #include <vector>
 
+#include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/http/http_version.h"
 #include "net/log/net_log.h"
 
 namespace base {
 class Pickle;
 class PickleIterator;
@@ skipping 291 matching lines @@
   // to exist but could not be parsed.  Otherwise, it defaults to 200 if the
   // response code is not found in the raw headers.
   int response_code() const { return response_code_; }
 
   // Returns the raw header string.
   const std::string& raw_headers() const { return raw_headers_; }
 
  private:
   friend class base::RefCountedThreadSafe<HttpResponseHeaders>;
 
-  using HeaderSet = std::unordered_set<std::string>;
+  typedef base::hash_set<std::string> HeaderSet;
 
   // The members of this structure point into raw_headers_.
   struct ParsedHeader;
   typedef std::vector<ParsedHeader> HeaderList;
 
   HttpResponseHeaders();
   ~HttpResponseHeaders();
 
   // Initializes from the given raw headers.
   void Parse(const std::string& raw_input);
@@ skipping 84 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_