Add RetainedRef uses where needed.

chrome/browser/sync_file_system/local/local_file_sync_context_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync_file_system/local/local_file_sync_context.h"
 
 #include <stdint.h>
 #include <utility>
 #include <vector>
 
@@ skipping 142 matching lines @@
               PrepareForSync(file_system_context, url,
                              LocalFileSyncContext::SYNC_EXCLUSIVE,
                              &metadata, &changes, nullptr));
     EXPECT_EQ(expected_file_type, metadata.file_type);
 
     status_ = SYNC_STATUS_UNKNOWN;
     sync_context_->ApplyRemoteChange(
         file_system_context, change, local_path, url,
         base::Bind(&LocalFileSyncContextTest::DidApplyRemoteChange,
                    base::Unretained(this),
-                   make_scoped_refptr(file_system_context), url));
+                   base::RetainedRef(file_system_context), url));
     base::MessageLoop::current()->Run();
     return status_;
   }
 
   void DidApplyRemoteChange(FileSystemContext* file_system_context,
                             const FileSystemURL& url,
                             SyncStatusCode status) {
     status_ = status;
     sync_context_->FinalizeExclusiveSync(
         file_system_context, url,
@@ skipping 779 matching lines @@
 
   // Make sure kDir and kFile are created by ApplyRemoteChange.
   EXPECT_EQ(base::File::FILE_OK, file_system.FileExists(kFile));
   EXPECT_EQ(base::File::FILE_OK, file_system.DirectoryExists(kDir));
 
   sync_context_->ShutdownOnUIThread();
   file_system.TearDown();
 }
 
 }  // namespace sync_file_system