Use TaskScheduler instead of blocking pool in aw_url_request_context_getter.cc.

android_webview/browser/net/aw_url_request_context_getter.cc

Index: android_webview/browser/net/aw_url_request_context_getter.cc
diff --git a/android_webview/browser/net/aw_url_request_context_getter.cc b/android_webview/browser/net/aw_url_request_context_getter.cc
index a3174299e02bf6cd5e2ce1da1445cf4d05d8e946..98bd9e99d74c470c1bb0a73925e5ba9885fe5d2c 100644
--- a/android_webview/browser/net/aw_url_request_context_getter.cc
+++ b/android_webview/browser/net/aw_url_request_context_getter.cc
@@ -22,6 +22,7 @@
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/browser_thread.h"
@@ -111,9 +112,12 @@ std::unique_ptr<net::URLRequestJobFactory> CreateJobFactory(
   bool set_protocol = aw_job_factory->SetProtocolHandler(
       url::kFileScheme,
       base::MakeUnique<net::FileProtocolHandler>(
-          content::BrowserThread::GetBlockingPool()
-              ->GetTaskRunnerWithShutdownBehavior(
-                  base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
+          base::CreateTaskRunnerWithTraits(
+              base::TaskTraits()
+                  .MayBlock()
+                  .WithPriority(base::TaskPriority::BACKGROUND)
+                  .WithShutdownBehavior(
+                      base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN))));
   DCHECK(set_protocol);
   set_protocol = aw_job_factory->SetProtocolHandler(
       url::kDataScheme, base::MakeUnique<net::DataProtocolHandler>());