chrome/browser: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

chrome/browser/sync/glue/sync_backend_registrar_unittest.cc

Index: chrome/browser/sync/glue/sync_backend_registrar_unittest.cc
diff --git a/chrome/browser/sync/glue/sync_backend_registrar_unittest.cc b/chrome/browser/sync/glue/sync_backend_registrar_unittest.cc
index 34adb95c58be3837c71f0c6b9987fdf1040df44b..e4eacc3cb4d22351b47299fcb5aa45956f2cc5d7 100644
--- a/chrome/browser/sync/glue/sync_backend_registrar_unittest.cc
+++ b/chrome/browser/sync/glue/sync_backend_registrar_unittest.cc
@@ -4,7 +4,9 @@
 
 #include "chrome/browser/sync/glue/sync_backend_registrar.h"
 
+#include "base/location.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "chrome/browser/sync/glue/ui_model_worker.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/sync_driver/change_processor_mock.h"
@@ -77,10 +79,9 @@ class SyncBackendRegistrarTest : public testing::Test {
   void TearDown() override {
     registrar_->RequestWorkerStopOnUIThread();
     test_user_share_.TearDown();
-    sync_thread_->message_loop()->PostTask(
-        FROM_HERE,
-        base::Bind(&SyncBackendRegistrar::Shutdown,
-                   base::Unretained(registrar_.release())));
+    sync_thread_->task_runner()->PostTask(
+        FROM_HERE, base::Bind(&SyncBackendRegistrar::Shutdown,
+                              base::Unretained(registrar_.release())));
     sync_thread_->message_loop()->RunUntilIdle();
   }
 
@@ -331,10 +332,9 @@ TEST_F(SyncBackendRegistrarShutdownTest, BlockingShutdown) {
   // Start the shutdown.
   registrar->RequestWorkerStopOnUIThread();
 
-  sync_thread->message_loop()->PostTask(
-      FROM_HERE,
-      base::Bind(&SyncBackendRegistrar::Shutdown,
-                 base::Unretained(registrar.release())));
+  sync_thread->task_runner()->PostTask(
+      FROM_HERE, base::Bind(&SyncBackendRegistrar::Shutdown,
+                            base::Unretained(registrar.release())));
 
   // Make sure the thread starts running.
   sync_thread->WaitUntilThreadStarted();