Use to base::checked_cast.

components/cloud_devices/description_items.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_CLOUD_DEVICES_CAPABILITY_INTERFACES_H_
 #define COMPONENTS_CLOUD_DEVICES_CAPABILITY_INTERFACES_H_
 
 // Defines common templates that could be used to create device specific
 // capabilities and print tickets.
 
 #include <vector>
 
 #include "base/logging.h"
-
+#include "base/numerics/safe_conversions.h"
 #include "components/cloud_devices/cloud_device_description.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace cloud_devices {
 
 // All traits below specify how to serialize and validate capabilities and
 // ticket items.
@@ skipping 101 matching lines @@
   }
 
   void AddOption(const Option& option) {
     AddDefaultOption(option, false);
   }
 
   void AddDefaultOption(const Option& option, bool is_default) {
     if (is_default) {
       DCHECK_EQ(default_idx_, -1);
       // Point to the last element.
-      default_idx_ = static_cast<int>(size());
+      default_idx_ = base::checked_cast<int>(size());
     }
     options_.push_back(option);
   }
 
  private:
   typedef std::vector<Option> OptionVector;
 
   OptionVector options_;
   int default_idx_;
 
@@ skipping 75 matching lines @@
 
  private:
   Option value_;
 
   DISALLOW_COPY_AND_ASSIGN(TicketItem);
 };
 
 }  // namespace cloud_devices
 
 #endif  // COMPONENTS_CLOUD_DEVICES_CAPABILITY_INTERFACES_H_