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diff --git a/net/base/auth_cache.h b/net/base/auth_cache.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef NET_BASE_AUTH_CACHE_H__
+#define NET_BASE_AUTH_CACHE_H__
+
+#include <string>
+#include <map>
+
+#include "net/base/auth.h"
+
+class GURL;
+
+// TODO(wtc): move AuthCache into the net namespace.
+
+// The AuthCache class is a simple cache structure to store authentication
+// information for ftp or http/https sites. Provides lookup, addition, and
+// validation of entries.
+class AuthCache {
+ public:
+  AuthCache() {}
+  ~AuthCache() {}
+
+  typedef std::string AuthCacheKey;
+
+  // Return the key for looking up the auth data in the auth cache for HTTP,
+  // consisting of the scheme, host, and port of the request URL and the
+  // realm in the auth challenge.
+  static AuthCacheKey HttpKey(const GURL& url,
+                              const AuthChallengeInfo& auth_info);
+
+  // Check if we have authentication data for given key.  The key parameter
+  // is input, consisting of the hostname and any other info (such as realm)
+  // appropriate for the protocol.  Return the address of corresponding
+  // AuthData object (if found) or NULL (if not found).
+  AuthData* Lookup(const AuthCacheKey& key);
+
+  // Add to the cache. If key already exists, this will overwrite. Both
+  // parameters are IN only.
+  void Add(const AuthCacheKey& key, AuthData* value) {
+    cache_[key] = value;
+  }
+
+  // Called when we have an auth failure to remove
+  // the likely invalid credentials.
+  void Remove(const AuthCacheKey& key) {
+    cache_.erase(key);
+  }
+
+ private:
+  typedef scoped_refptr<AuthData> AuthCacheValue;
+  typedef std::map<AuthCacheKey,AuthCacheValue> AuthCacheMap;
+
+  // internal representation of cache, an STL map.
+  AuthCacheMap cache_;
+};
+
+#endif  // NET_BASE_AUTH_CACHE_H__