Use HttpRequestHeaders for extra_headers.

net/http/http_cache.h

 // Copyright (c) 2010 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.
 
 // This file declares a HttpTransactionFactory implementation that can be
 // layered on top of another HttpTransactionFactory to add HTTP caching.  The
 // caching logic follows RFC 2616 (any exceptions are called out in the code).
 //
 // The HttpCache takes a disk_cache::Backend as a parameter, and uses that for
 // the cache storage.
@@ skipping 21 matching lines @@
 namespace disk_cache {
 class Backend;
 class Entry;
 }
 
 namespace net {
 
 class HostResolver;
 class HttpAuthHandlerFactory;
 class HttpNetworkSession;
-class HttpRequestInfo;
+struct HttpRequestInfo;
 class HttpResponseInfo;
 class IOBuffer;
 class NetworkChangeNotifier;
 class ProxyService;
 class SSLConfigService;
 
 class HttpCache : public HttpTransactionFactory,
                   public base::SupportsWeakPtr<HttpCache> {
  public:
   ~HttpCache();
@@ skipping 266 matching lines @@
 
   typedef base::hash_map<std::string, int> PlaybackCacheMap;
   scoped_ptr<PlaybackCacheMap> playback_cache_map_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpCache);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_H_