Fix and refactor downloaded file handling in the loading stack

content/browser/loader/downloaded_temp_file_impl.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 "content/browser/loader/downloaded_temp_file_impl.h"
+
+#include "content/browser/loader/resource_dispatcher_host_impl.h"
+#include "storage/browser/blob/shareable_file_reference.h"
+
+namespace content {
+
+DownloadedTempFileImpl::DownloadedTempFileImpl(ResourceDispatcherHostImpl* rdh,
+                                               int child_id,
+                                               int request_id,
+                                               const base::FilePath& path)
+    : binding_(this),
+      rdh_(rdh),
+      child_id_(child_id),
+      request_id_(request_id),
+      reference_(storage::ShareableFileReference::Get(path)) {
+  DCHECK(rdh_);
+  DCHECK(reference_);
+}
+
+DownloadedTempFileImpl::~DownloadedTempFileImpl() {}
+
+void DownloadedTempFileImpl::OnConnectionError() {
+  rdh_->UnregisterDownloadedTempFile(child_id_, request_id_);
+}
+
+mojo::InterfacePtr<mojom::DownloadedTempFile>
+DownloadedTempFileImpl::CreateInterfacePtrAndBind() {
+  auto ptr = binding_.CreateInterfacePtrAndBind();
+  binding_.set_connection_error_handler(base::Bind(
+      &DownloadedTempFileImpl::OnConnectionError, base::Unretained(this)));
+  return ptr;
+}
+
+}  // namespace content