[Offline Pages] Fix cases where returning NOT_FOUND when deleting.

components/offline_pages/offline_page_model_impl_unittest.cc

 // Copyright 2015 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 <stdint.h>
 #include <algorithm>
 #include <utility>
 
@@ skipping 669 matching lines @@
 
   EXPECT_EQ(last_deleted_offline_id(), offline1);
   EXPECT_EQ(last_deleted_client_id(), kTestClientId1);
   EXPECT_EQ(DeletePageResult::SUCCESS, last_delete_result());
   EXPECT_EQ(0u, store->GetAllPages().size());
 }
 
 TEST_F(OfflinePageModelImplTest, DeletePageNotFound) {
   DeletePage(1234LL, base::Bind(&OfflinePageModelImplTest::OnDeletePageDone,
                                 AsWeakPtr()));
-  EXPECT_EQ(DeletePageResult::NOT_FOUND, last_delete_result());
+  EXPECT_EQ(DeletePageResult::SUCCESS, last_delete_result());
 
   ResetResults();
 
   model()->DeletePagesByURLPredicate(
       base::Bind(&URLSpecContains, "page.com"),
       base::Bind(&OfflinePageModelImplTest::OnDeletePageDone, AsWeakPtr()));
-  EXPECT_EQ(DeletePageResult::NOT_FOUND, last_delete_result());
+  EXPECT_EQ(DeletePageResult::SUCCESS, last_delete_result());
 }
 
 TEST_F(OfflinePageModelImplTest, DeletePageStoreFailureOnRemove) {
   // Save a page.
   SavePage(kTestUrl, kTestClientId1);
   int64_t offline_id = last_save_offline_id();
   ResetResults();
 
   // Try to delete this page.
   GetStore()->set_test_scenario(
@@ skipping 363 matching lines @@
   std::unique_ptr<base::FeatureList> feature_list2(new base::FeatureList);
   feature_list2->InitializeFromCommandLine(
       std::string(offline_pages::kOfflineBookmarksFeature.name) + "," +
           offline_pages::kOfflinePagesBackgroundLoadingFeature.name,
       "");
   base::FeatureList::SetInstance(std::move(feature_list2));
   EXPECT_TRUE(offline_pages::IsOfflinePagesBackgroundLoadingEnabled());
 }
 
 }  // namespace offline_pages