feat: migrate protocol module to NetworkService (Part 7) (#18290)

* fix: make IsProtocolHandled return true for builtin schemes

* fix: return ERR_NOT_IMPLEMENTED for wrong arg

* Initial work of AsarURLLoader

* Put normal file logics in AsarURLLoader

* Implement asar file reading

* Don't change URL for unpacked file

* Fix cpplint warning

atom/browser/net/asar/asar_url_loader.h

@@ -0,0 +1,20 @@
+// Copyright (c) 2019 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_NET_ASAR_ASAR_URL_LOADER_H_
+#define ATOM_BROWSER_NET_ASAR_ASAR_URL_LOADER_H_
+
+#include "services/network/public/mojom/url_loader.mojom.h"
+
+namespace asar {
+
+void CreateAsarURLLoader(
+    const network::ResourceRequest& request,
+    network::mojom::URLLoaderRequest loader,
+    network::mojom::URLLoaderClientPtr client,
+    scoped_refptr<net::HttpResponseHeaders> extra_response_headers);
+
+}  // namespace asar
+
+#endif  // ATOM_BROWSER_NET_ASAR_ASAR_URL_LOADER_H_