Use std::tie() for operator< in extensions/

extensions/common/permissions/usb_device_permission_data.cc

 // 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.
 
 #include "extensions/common/permissions/usb_device_permission_data.h"
 
 #include <string>
+#include <tuple>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/values.h"
 #include "extensions/common/permissions/api_permission.h"
 #include "extensions/common/permissions/usb_device_permission.h"
 
@@ skipping 65 matching lines @@
   else if (temp < ANY_INTERFACE || temp > kuint8max)
     return false;
   else
     interface_id_ = temp;
 
   return true;
 }
 
 bool UsbDevicePermissionData::operator<(
     const UsbDevicePermissionData& rhs) const {
-  if (vendor_id_ == rhs.vendor_id_) {
-    if (product_id_ == rhs.product_id_)
-      return interface_id_ < rhs.interface_id_;
-
-    return product_id_ < rhs.product_id_;
-  }
-  return vendor_id_ < rhs.vendor_id_;
+  return std::tie(vendor_id_, product_id_, interface_id_) <
+         std::tie(rhs.vendor_id_, rhs.product_id_, rhs.interface_id_);
 }
 
 bool UsbDevicePermissionData::operator==(
     const UsbDevicePermissionData& rhs) const {
   return vendor_id_ == rhs.vendor_id_ &&
       product_id_ == rhs.product_id_ &&
       interface_id_ == rhs.interface_id_;
 }
 
 }  // namespace extensions