Allow constexpr variables of TimeDelta type.

components/offline_pages/offline_page_model.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.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 23 matching lines @@
 // be deleted or re-ordered and new ones should be added to the end.
 enum ClearAllStatus {
   CLEAR_ALL_SUCCEEDED,
   STORE_RESET_FAILED,
   STORE_RELOAD_FAILED,
 
   // NOTE: always keep this entry at the end.
   CLEAR_ALL_STATUS_COUNT
 };
 
-// Threshold for how old offline copy of a page should be before we offer to
-// delete it to free up space.
-const base::TimeDelta kPageCleanUpThreshold = base::TimeDelta::FromDays(30);

[Jeffrey Yasskin, 2016/05/13 23:39:43]

Apparently
(https://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device-gn/bu...)
making TimeDelta a literal type makes -Wunused-const-variable stronger.

-
 // The maximum histogram size for the metrics that measure time between views of
 // a given page.
 const base::TimeDelta kMaxOpenedPageHistogramBucket =
     base::TimeDelta::FromDays(90);
 
 SavePageResult ToSavePageResult(ArchiverResult archiver_result) {
   SavePageResult result;
   switch (archiver_result) {
     case ArchiverResult::SUCCESSFULLY_CREATED:
       result = SavePageResult::SUCCESS;
@@ skipping 776 matching lines @@
 void OfflinePageModel::RunWhenLoaded(const base::Closure& task) {
   if (!is_loaded_) {
     delayed_tasks_.push_back(task);
     return;
   }
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, task);
 }
 
 }  // namespace offline_pages