Remove the mojo serial interfaces and related infrastructure.

extensions/browser/api/serial/serial_service_factory.h

Index: extensions/browser/api/serial/serial_service_factory.h
diff --git a/extensions/browser/api/serial/serial_service_factory.h b/extensions/browser/api/serial/serial_service_factory.h
deleted file mode 100644
index df74c9ba531d90014322bdc22035d8533dea91e7..0000000000000000000000000000000000000000
--- a/extensions/browser/api/serial/serial_service_factory.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2015 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.
-
-#ifndef EXTENSIONS_BROWSER_API_SERIAL_SERIAL_SERVICE_FACTORY_H_
-#define EXTENSIONS_BROWSER_API_SERIAL_SERIAL_SERVICE_FACTORY_H_
-
-#include "base/callback.h"
-#include "device/serial/serial.mojom.h"
-#include "extensions/browser/mojo/service_registration.h"
-
-namespace extensions {
-
-void BindToSerialServiceRequest(
-    mojo::InterfaceRequest<device::serial::SerialService> request);
-
-void SetSerialServiceFactoryForTest(const base::Callback<void(
-    mojo::InterfaceRequest<device::serial::SerialService> request)>* callback);
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_BROWSER_API_SERIAL_SERIAL_SERVICE_FACTORY_H_