Fix memory leak in file service.

services/file/file_service.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_service.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/weak_ptr.h"
 #include "components/filesystem/lock_table.h"
 #include "components/leveldb/leveldb_service_impl.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/file/file_system.h"
 #include "services/file/user_id_map.h"
 #include "services/service_manager/public/cpp/connection.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 #include "services/service_manager/public/cpp/service_context.h"
 
 namespace file {
 
 class FileService::FileSystemObjects
     : public base::SupportsWeakPtr<FileSystemObjects> {
  public:
   // Created on the main thread.
   FileSystemObjects(base::FilePath user_dir) : user_dir_(user_dir) {}
 
   // Destroyed on the |file_service_runner_|.
   ~FileSystemObjects() {}
 
   // Called on the |file_service_runner_|.
   void OnFileSystemRequest(const service_manager::Identity& remote_identity,
                            mojom::FileSystemRequest request) {
     if (!lock_table_)
       lock_table_ = new filesystem::LockTable;
-    file_system_bindings_.AddBinding(new FileSystem(user_dir_, lock_table_),
-                                     std::move(request));
+    mojo::MakeStrongBinding(
+        base::MakeUnique<FileSystem>(user_dir_, lock_table_),
+        std::move(request));
   }
 
  private:
-  mojo::BindingSet<mojom::FileSystem> file_system_bindings_;
   scoped_refptr<filesystem::LockTable> lock_table_;
   base::FilePath user_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemObjects);
 };
 
 class FileService::LevelDBServiceObjects
     : public base::SupportsWeakPtr<LevelDBServiceObjects> {
  public:
   // Created on the main thread.
@@ skipping 66 matching lines @@
                          leveldb::mojom::LevelDBServiceRequest request) {
   leveldb_service_runner_->PostTask(
       FROM_HERE,
       base::Bind(
           &FileService::LevelDBServiceObjects::OnLevelDBServiceRequest,
           leveldb_objects_->AsWeakPtr(), remote_identity,
           base::Passed(&request)));
 }
 
 }  // namespace user_service