Add an eviction mechanism for SDCH dictionaries.

chrome/browser/net/chrome_sdch_policy.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.
-
-#ifndef CHROME_BROWSER_NET_CHROME_SDCH_POLICY_H_
-#define CHROME_BROWSER_NET_CHROME_SDCH_POLICY_H_
-
-#include <string>
-
-#include "net/base/sdch_observer.h"
-#include "net/url_request/sdch_dictionary_fetcher.h"
-
-class GURL;
-
-namespace net {
-class SdchManager;
-class URLRequestContext;
-}
-
-// Implementation of chrome embedder policy for SDCH.  Handles fetches.
-// TODO(rdsmith): Implement dictionary prioritization.
-class ChromeSdchPolicy : public net::SdchObserver {
- public:
-  // Consumer must guarantee that |sdch_manager| and |context| outlive
-  // this object.
-  ChromeSdchPolicy(net::SdchManager* sdch_manager,
-                   net::URLRequestContext* context);
-  ~ChromeSdchPolicy() override;
-
-  void OnDictionaryFetched(const std::string& dictionary_text,
-                           const GURL& dictionary_url,
-                           const net::BoundNetLog& net_log);
-
-  // SdchObserver implementation.
-  void OnGetDictionary(net::SdchManager* manager,
-                       const GURL& request_url,
-                       const GURL& dictionary_url) override;
-  void OnClearDictionaries(net::SdchManager* manager) override;
-
- private:
-  net::SdchManager* manager_;
-  net::SdchDictionaryFetcher fetcher_;
-};
-
-#endif  // CHROME_BROWSER_NET_CHROME_SDCH_POLICY_H_