Use TaskScheduler instead of blocking pool in download_target_determiner.cc.

chrome/browser/download/download_target_determiner.cc

 // Copyright 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 "chrome/browser/download/download_target_determiner.h"
 
 #include "base/location.h"
 #include "base/rand_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/safe_browsing/file_type_policies.h"
@@ skipping 539 matching lines @@
   next_state_ = STATE_CHECK_DOWNLOAD_URL;
 
 #if defined(OS_WIN)
   if (!local_path_.MatchesExtension(FILE_PATH_LITERAL(".pdf")))
     return CONTINUE;
   if (!IsAdobeReaderDefaultPDFViewer()) {
     g_is_adobe_reader_up_to_date_ = false;
     return CONTINUE;
   }
 
-  base::PostTaskAndReplyWithResult(
-      BrowserThread::GetBlockingPool(),
-      FROM_HERE,
+  base::PostTaskWithTraitsAndReplyWithResult(
+      FROM_HERE, base::TaskTraits().MayBlock(),
       base::Bind(&::IsAdobeReaderUpToDate),
       base::Bind(&DownloadTargetDeterminer::DetermineIfAdobeReaderUpToDateDone,
                  weak_ptr_factory_.GetWeakPtr()));
   return QUIT_DOLOOP;
 #else
   return CONTINUE;
 #endif
 }
 
 #if defined(OS_WIN)
@@ skipping 360 matching lines @@
     const base::FilePath& suggested_path) {
   return base::FilePath(suggested_path.value() + kCrdownloadSuffix);
 }
 
 #if defined(OS_WIN)
 // static
 bool DownloadTargetDeterminer::IsAdobeReaderUpToDate() {
   return g_is_adobe_reader_up_to_date_;
 }
 #endif