Split the RequestPicker task into two separate tasks.

components/offline_pages/background/cleanup_task_factory.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/pick_request_task_factory.h"
+#include "components/offline_pages/background/cleanup_task_factory.h"
 
 #include "components/offline_pages/background/offliner_policy.h"
 #include "components/offline_pages/background/request_coordinator_event_logger.h"
 #include "components/offline_pages/background/request_notifier.h"
 
 namespace offline_pages {
 
 // Capture the common parameters that we will need to make a pick task,
 // and use them when making tasks.  Create this once each session, and
 // use it to build a picker task when needed.
-PickRequestTaskFactory::PickRequestTaskFactory(
+CleanupTaskFactory::CleanupTaskFactory(
     OfflinerPolicy* policy,
     RequestNotifier* notifier,
     RequestCoordinatorEventLogger* event_logger)
-    : policy_(policy), notifier_(notifier), event_logger_(event_logger) {}
+    : policy_(policy), notifier_(notifier), event_logger_(event_logger) {
+  DCHECK(policy);
+  DCHECK(notifier);
+  DCHECK(event_logger);
+}
 
-PickRequestTaskFactory::~PickRequestTaskFactory() {}
+CleanupTaskFactory::~CleanupTaskFactory() {}
 
-std::unique_ptr<PickRequestTask> PickRequestTaskFactory::CreatePickerTask(
-    RequestQueueStore* store,
-    const PickRequestTask::RequestPickedCallback& picked_callback,
-    const PickRequestTask::RequestNotPickedCallback& not_picked_callback,
-    const PickRequestTask::RequestCountCallback& request_count_callback,
-    DeviceConditions& conditions,
-    std::set<int64_t>& disabled_requests) {
-  std::unique_ptr<PickRequestTask> task(new PickRequestTask(
-      store, policy_, notifier_, event_logger_, picked_callback,
-      not_picked_callback, request_count_callback, conditions,
-      disabled_requests));
+std::unique_ptr<CleanupTask> CleanupTaskFactory::CreateCleanupTask(
+    RequestQueueStore* store) {
+  std::unique_ptr<CleanupTask> task(
+      new CleanupTask(store, policy_, notifier_, event_logger_));
   return task;
 }
 
 }  // namespace offline_pages