Use TaskScheduler instead of blocking pool in download_target_determiner.cc.

chrome/browser/download/download_target_determiner.cc

Index: chrome/browser/download/download_target_determiner.cc
diff --git a/chrome/browser/download/download_target_determiner.cc b/chrome/browser/download/download_target_determiner.cc
index f1d1845138c9e82acb617c042c178e5ba0136088..95ea343930bbb2e5c331c55caa29b565349b8ee4 100644
--- a/chrome/browser/download/download_target_determiner.cc
+++ b/chrome/browser/download/download_target_determiner.cc
@@ -8,6 +8,7 @@
 #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"
@@ -567,9 +568,8 @@ DownloadTargetDeterminer::Result
     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()));