Add an eviction mechanism for SDCH dictionaries.

chrome/browser/net/chrome_sdch_policy.cc

-// 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.
-
-#include "chrome/browser/net/chrome_sdch_policy.h"
-
-#include "base/bind.h"
-#include "net/base/sdch_manager.h"
-#include "net/base/sdch_net_log_params.h"
-
-ChromeSdchPolicy::ChromeSdchPolicy(net::SdchManager* sdch_manager,
-                                   net::URLRequestContext* context)
-    : manager_(sdch_manager),
-      // Because |fetcher_| is owned by ChromeSdchPolicy, the
-      // ChromeSdchPolicy object will be available for the lifetime
-      // of |fetcher_|.
-      fetcher_(context,
-               base::Bind(&ChromeSdchPolicy::OnDictionaryFetched,
-                          base::Unretained(this))) {
-  manager_->AddObserver(this);
-}
-
-ChromeSdchPolicy::~ChromeSdchPolicy() {
-  manager_->RemoveObserver(this);
-}
-
-void ChromeSdchPolicy::OnDictionaryFetched(const std::string& dictionary_text,
-                                           const GURL& dictionary_url,
-                                           const net::BoundNetLog& net_log) {
-  net::SdchProblemCode rv =
-      manager_->AddSdchDictionary(dictionary_text, dictionary_url);
-  if (rv != net::SDCH_OK) {
-    net::SdchManager::SdchErrorRecovery(rv);
-    net_log.AddEvent(net::NetLog::TYPE_SDCH_DICTIONARY_ERROR,
-                     base::Bind(&net::NetLogSdchDictionaryFetchProblemCallback,
-                                rv, dictionary_url, true));
-  }
-}
-
-void ChromeSdchPolicy::OnGetDictionary(net::SdchManager* manager,
-                                       const GURL& request_url,
-                                       const GURL& dictionary_url) {
-  fetcher_.Schedule(dictionary_url);
-}
-
-void ChromeSdchPolicy::OnClearDictionaries(net::SdchManager* manager) {
-  fetcher_.Cancel();
-}