Temporarily remove "last_n" from availability searches.

components/offline_pages/offline_page_model_impl.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/offline_page_model_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/rand_util.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "components/offline_pages/archive_manager.h"
+#include "components/offline_pages/client_namespace_constants.h"
 #include "components/offline_pages/client_policy_controller.h"
 #include "components/offline_pages/offline_page_item.h"
 #include "components/offline_pages/offline_page_storage_manager.h"
 #include "url/gurl.h"
 
 using ArchiverResult = offline_pages::OfflinePageArchiver::ArchiverResult;
 using ClearStorageCallback =
     offline_pages::OfflinePageStorageManager::ClearStorageCallback;
 using ClearStorageResult =
     offline_pages::OfflinePageStorageManager::ClearStorageResult;
@@ skipping 399 matching lines @@
       base::Bind(&OfflinePageModelImpl::CheckPagesExistOfflineAfterLoadDone,
                  weak_ptr_factory_.GetWeakPtr(), urls, callback));
 }
 
 void OfflinePageModelImpl::CheckPagesExistOfflineAfterLoadDone(
     const std::set<GURL>& urls,
     const CheckPagesExistOfflineCallback& callback) {
   DCHECK(is_loaded_);
   CheckPagesExistOfflineResult result;
   for (const auto& id_page_pair : offline_pages_) {
-    if (id_page_pair.second.IsExpired())
+    // TODO(dewittj): Remove the "Last N" restriction in favor of a better query
+    // interface.  See https://crbug.com/622763 for information.
+    if (id_page_pair.second.IsExpired() ||
+        id_page_pair.second.client_id.name_space == kLastNNamespace)
       continue;
     auto iter = urls.find(id_page_pair.second.url);
     if (iter != urls.end())
       result.insert(*iter);
   }
   callback.Run(result);
 }
 
 void OfflinePageModelImpl::GetAllPages(
     const MultipleOfflinePageItemCallback& callback) {
@@ skipping 532 matching lines @@
 void OfflinePageModelImpl::RunWhenLoaded(const base::Closure& task) {
   if (!is_loaded_) {
     delayed_tasks_.push_back(task);
     return;
   }
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, task);
 }
 
 }  // namespace offline_pages