Use saturated_cast<> instead of checked_cast<> for converting

net/disk_cache/simple/simple_index.cc

 // Copyright (c) 2013 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 "net/disk_cache/simple/simple_index.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 #include <utility>
@@ skipping 87 matching lines @@
       base::TimeDelta::FromSeconds(last_used_time_seconds_since_epoch_);
 }
 
 void EntryMetadata::SetLastUsedTime(const base::Time& last_used_time) {
   // Preserve nullity.
   if (last_used_time.is_null()) {
     last_used_time_seconds_since_epoch_ = 0;
     return;
   }
 
-  last_used_time_seconds_since_epoch_ = base::checked_cast<uint32_t>(
+  last_used_time_seconds_since_epoch_ = base::saturated_cast<uint32_t>(
       (last_used_time - base::Time::UnixEpoch()).InSeconds());
   // Avoid accidental nullity.
   if (last_used_time_seconds_since_epoch_ == 0)
     last_used_time_seconds_since_epoch_ = 1;
 }
 
 uint64_t EntryMetadata::GetEntrySize() const {
   return entry_size_;
 }
 
@@ skipping 364 matching lines @@
                        start - last_write_to_disk_);
     }
   }
   last_write_to_disk_ = start;
 
   index_file_->WriteToDisk(reason, entries_set_, cache_size_, start,
                            app_on_background_, base::Closure());
 }
 
 }  // namespace disk_cache