Use PowerSaveBlocker for audio and video on Chrome OS.

content/browser/download/download_resource_handler.cc

 // Copyright (c) 2012 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 "content/browser/download/download_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 113 matching lines @@
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&InitializeDownloadTabInfoOnUIThread,
                  DownloadRequestHandle(AsWeakPtr(),
                                        request_info->GetChildID(),
                                        request_info->GetRouteID(),
                                        request_info->GetRequestID()),
                  tab_info_));
   power_save_blocker_ = PowerSaveBlocker::Create(
       PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
-      "Download in progress");
+      PowerSaveBlocker::kReasonOther, "Download in progress");
 }
 
 bool DownloadResourceHandler::OnUploadProgress(uint64 position,
                                                uint64 size) {
   return true;
 }
 
 bool DownloadResourceHandler::OnRequestRedirected(
     const net::RedirectInfo& redirect_info,
     ResourceResponse* response,
@@ skipping 386 matching lines @@
   // tab_info_ must be destroyed on UI thread, since
   // InitializeDownloadTabInfoOnUIThread might still be using it.
   if (tab_info_)
     BrowserThread::DeleteSoon(BrowserThread::UI, FROM_HERE, tab_info_);
 
   UMA_HISTOGRAM_TIMES("SB2.DownloadDuration",
                       base::TimeTicks::Now() - download_start_time_);
 }
 
 }  // namespace content