[Offline Pages] Remove expired requests from the queue.

components/offline_pages/background/request_coordinator.cc

 // Copyright 2016 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 "components/offline_pages/background/request_coordinator.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 45 matching lines @@
       policy_(std::move(policy)),
       factory_(std::move(factory)),
       queue_(std::move(queue)),
       scheduler_(std::move(scheduler)),
       active_request_(nullptr),
       last_offlining_status_(Offliner::RequestStatus::UNKNOWN),
       offliner_timeout_(base::TimeDelta::FromSeconds(
           policy_->GetSinglePageTimeLimitInSeconds())),
       weak_ptr_factory_(this) {
   DCHECK(policy_ != nullptr);
-  picker_.reset(new RequestPicker(queue_.get(), policy_.get()));
+  picker_.reset(new RequestPicker(queue_.get(), policy_.get(), this));
 }
 
 RequestCoordinator::~RequestCoordinator() {}
 
 bool RequestCoordinator::SavePageLater(
     const GURL& url, const ClientId& client_id, bool user_requested) {
   DVLOG(2) << "URL is " << url << " " << __func__;
 
   if (!OfflinePageModel::CanSaveURL(url)) {
     DVLOG(1) << "Not able to save page for requested url: " << url;
@@ skipping 280 matching lines @@
       policy_->UnmeteredNetworkRequiredForUserRequestedPage());
   return trigger_conditions;
 }
 
 void RequestCoordinator::GetOffliner() {
   if (!offliner_) {
     offliner_ = factory_->GetOffliner(policy_.get());
   }
 }
 
+void RequestCoordinator::NotifyRequestsExpired(
+    const std::vector<SavePageRequest>& expired_requests,
+    RequestQueue::UpdateRequestResult result) {
+  // Notify observers that requests are expired.
+}
+
 }  // namespace offline_pages