Fix and refactor downloaded file handling in the loading stack

content/browser/loader/downloaded_temp_file_impl.cc

Index: content/browser/loader/downloaded_temp_file_impl.cc
diff --git a/content/browser/loader/downloaded_temp_file_impl.cc b/content/browser/loader/downloaded_temp_file_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3b27d4356a8d462c05f1b3b97c32938cd91b570f
--- /dev/null
+++ b/content/browser/loader/downloaded_temp_file_impl.cc
@@ -0,0 +1,35 @@
+// 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 "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace content {
+namespace {
+
+void OnConnectionError(int child_id, int request_id) {

[mmenke, 2016/11/22 16:19:33]

Can we just make this a member of DownloadedTempFileImpl?  Seems weird to have
it here...Or could we just move it to the destructor instead?  IF it's a strong
binding, we'll be destroyed on connection error, anyways, right?

[tzik, 2016/11/24 14:06:40]

Done.

+  ResourceDispatcherHostImpl::Get()->UnregisterDownloadedTempFile(child_id,
+                                                                  request_id);
+}
+
+}  // namespace
+
+// static
+mojo::InterfacePtr<mojom::DownloadedTempFile> DownloadedTempFileImpl::Create(
+    int child_id,
+    int request_id) {
+  mojo::InterfacePtr<mojom::DownloadedTempFile> ptr;
+  auto binding = mojo::MakeStrongBinding(
+      base::MakeUnique<DownloadedTempFileImpl>(), mojo::GetProxy(&ptr));
+  binding->set_connection_error_handler(
+      base::Bind(&OnConnectionError, child_id, request_id));
+  return ptr;
+}
+
+DownloadedTempFileImpl::~DownloadedTempFileImpl() {}
+DownloadedTempFileImpl::DownloadedTempFileImpl() {}
+
+}  // namespace content