Add a Model to the download component.

components/download/public/download_params.h

 // Copyright 2017 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_DOWNLOAD_PUBLIC_DOWNLOAD_PARAMS_H_
 #define COMPONENTS_DOWNLOAD_PUBLIC_DOWNLOAD_PARAMS_H_
 
 #include "base/callback.h"
 #include "base/time/time.h"
 #include "components/download/public/clients.h"
@@ skipping 49 matching lines @@
     UI = 3,
 
     // The default priority for all tasks unless overridden.
     DEFAULT = NORMAL,
   };
 
   SchedulingParams();
   SchedulingParams(const SchedulingParams& other) = default;
   ~SchedulingParams() = default;
 
-  // Cancel the download after this delay.  Will cancel in-progress downloads.
-  base::TimeDelta cancel_after;
+  // Cancel the download after this time.  Will cancel in-progress downloads.
+  base::Time cancel_time;
 
   // The suggested priority.  Non-UI priorities may not be honored by the
   // DownloadService based on internal criteria and settings.
   Priority priority;
   NetworkRequirements network_requirements;
   BatteryRequirements battery_requirements;
 };
 
 // The parameters describing how to build the request when starting a download.
 struct RequestParams {
@@ skipping 44 matching lines @@
   // will occur.
   SchedulingParams scheduling_params;
 
   // The parameters that define the actual download request to make.
   RequestParams request_params;
 };
 
 }  // namespace download
 
 #endif  // COMPONENTS_DOWNLOAD_PUBLIC_DOWNLOAD_PARAMS_H_