Add RetainedRef uses where needed.

chrome/browser/sync_file_system/local/canned_syncable_file_system.cc

Index: chrome/browser/sync_file_system/local/canned_syncable_file_system.cc
diff --git a/chrome/browser/sync_file_system/local/canned_syncable_file_system.cc b/chrome/browser/sync_file_system/local/canned_syncable_file_system.cc
index 309a53a2418c17ccef3a2c63d6e16240a2f9dfa1..3c09c35a74bb0f00ab225ac76abfcf664f33eec0 100644
--- a/chrome/browser/sync_file_system/local/canned_syncable_file_system.cc
+++ b/chrome/browser/sync_file_system/local/canned_syncable_file_system.cc
@@ -69,9 +69,9 @@ R RunOnThread(
   task_runner->PostTask(
       location,
       base::Bind(task, base::Bind(&AssignAndQuit<R>,
-                                  base::ThreadTaskRunnerHandle::Get(),
-                                  run_loop.QuitClosure(),
-                                  &result)));
+                                  base::RetainedRef(
+                                      base::ThreadTaskRunnerHandle::Get()),
+                                  run_loop.QuitClosure(), &result)));
   run_loop.Run();
   return result;
 }
@@ -99,7 +99,7 @@ void VerifySameTaskRunner(
   ASSERT_TRUE(runner1 != nullptr);
   ASSERT_TRUE(runner2 != nullptr);
   runner1->PostTask(FROM_HERE,
-                    base::Bind(&EnsureRunningOn, make_scoped_refptr(runner2)));
+                    base::Bind(&EnsureRunningOn, base::RetainedRef(runner2)));
 }
 
 void OnCreateSnapshotFileAndVerifyData(
@@ -292,12 +292,12 @@ File::Error CannedSyncableFileSystem::OpenFileSystem() {
   base::RunLoop run_loop;
   io_task_runner_->PostTask(
       FROM_HERE,
-      base::Bind(&CannedSyncableFileSystem::DoOpenFileSystem,
-                 base::Unretained(this),
-                 base::Bind(&CannedSyncableFileSystem::DidOpenFileSystem,
-                            base::Unretained(this),
-                            base::ThreadTaskRunnerHandle::Get(),
-                            run_loop.QuitClosure())));
+      base::Bind(
+          &CannedSyncableFileSystem::DoOpenFileSystem, base::Unretained(this),
+          base::Bind(&CannedSyncableFileSystem::DidOpenFileSystem,
+                     base::Unretained(this),
+                     base::RetainedRef(base::ThreadTaskRunnerHandle::Get()),
+                     run_loop.QuitClosure())));
   run_loop.Run();
 
   if (backend()->sync_context()) {
@@ -738,12 +738,10 @@ void CannedSyncableFileSystem::DidOpenFileSystem(
   if (!original_task_runner->RunsTasksOnCurrentThread()) {
     DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
     original_task_runner->PostTask(
-        FROM_HERE,
-        base::Bind(&CannedSyncableFileSystem::DidOpenFileSystem,
-                   base::Unretained(this),
-                   make_scoped_refptr(original_task_runner),
-                   quit_closure,
-                   root, name, result));
+        FROM_HERE, base::Bind(&CannedSyncableFileSystem::DidOpenFileSystem,
+                              base::Unretained(this),
+                              base::RetainedRef(original_task_runner),
+                              quit_closure, root, name, result));
     return;
   }
   result_ = result;