[chrome/browser/chromeos/drive] Avoid use of MessageLoopProxy by use of TTRH

chrome/browser/chromeos/drive/file_system_util_unittest.cc

Index: chrome/browser/chromeos/drive/file_system_util_unittest.cc
diff --git a/chrome/browser/chromeos/drive/file_system_util_unittest.cc b/chrome/browser/chromeos/drive/file_system_util_unittest.cc
index 7bbbe0a0de5bad20292263779fb23087dc84fe98..e18101ee178afddd1858c285f1189efdf852f125 100644
--- a/chrome/browser/chromeos/drive/file_system_util_unittest.cc
+++ b/chrome/browser/chromeos/drive/file_system_util_unittest.cc
@@ -9,7 +9,9 @@
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/thread_task_runner_handle.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_profile.h"
@@ -131,8 +133,8 @@ TEST_F(FileSystemUtilTest, ExtractDrivePathFromFileSystemUrl) {
       storage::ExternalMountPoints::CreateRefCounted();
   scoped_refptr<storage::FileSystemContext> context(
       new storage::FileSystemContext(
-          base::MessageLoopProxy::current().get(),
-          base::MessageLoopProxy::current().get(),
+          base::ThreadTaskRunnerHandle::Get().get(),
+          base::ThreadTaskRunnerHandle::Get().get(),
           mount_points.get(),
           NULL,  // special_storage_policy
           NULL,  // quota_manager_proxy,