Privatize StrongBinding lifetime management

services/file/file_system.cc

 // Copyright 2016 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 "services/file/file_system.h"
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/filesystem/directory_impl.h"
 #include "components/filesystem/lock_table.h"
 #include "components/filesystem/public/interfaces/types.mojom.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/shell/public/cpp/connection.h"
 
 namespace file {
 
 FileSystem::FileSystem(const base::FilePath& base_user_dir,
                        const scoped_refptr<filesystem::LockTable>& lock_table)
     : lock_table_(lock_table), path_(base_user_dir) {
   base::CreateDirectory(path_);
 }
 
 FileSystem::~FileSystem() {}
 
 void FileSystem::GetDirectory(filesystem::mojom::DirectoryRequest request,
                               const GetDirectoryCallback& callback) {
-  new filesystem::DirectoryImpl(std::move(request), path_,
-                                scoped_refptr<filesystem::SharedTempDir>(),
-                                lock_table_);
+  mojo::MakeStrongBinding(
+      base::MakeUnique<filesystem::DirectoryImpl>(
+          path_, scoped_refptr<filesystem::SharedTempDir>(), lock_table_),
+      std::move(request));
   callback.Run();
 }
 
 void FileSystem::GetSubDirectory(const std::string& sub_directory_path,
                                  filesystem::mojom::DirectoryRequest request,
                                  const GetSubDirectoryCallback& callback) {
   // Ensure that we've made |subdirectory| recursively under our user dir.
   base::FilePath subdir = path_.Append(
 #if defined(OS_WIN)
       base::UTF8ToWide(sub_directory_path));
 #else
       sub_directory_path);
 #endif
   base::File::Error error;
   if (!base::CreateDirectoryAndGetError(subdir, &error)) {
     callback.Run(static_cast<filesystem::mojom::FileError>(error));
     return;
   }
 
-  new filesystem::DirectoryImpl(std::move(request), subdir,
-                                scoped_refptr<filesystem::SharedTempDir>(),
-                                lock_table_);
+  mojo::MakeStrongBinding(
+      base::MakeUnique<filesystem::DirectoryImpl>(
+          subdir, scoped_refptr<filesystem::SharedTempDir>(), lock_table_),
+      std::move(request));
   callback.Run(filesystem::mojom::FileError::OK);
 }
 
 }  // namespace file