Remove remote tree host and some related input and metro_driver code

win8/metro_driver/metro_driver.h

Index: win8/metro_driver/metro_driver.h
diff --git a/win8/metro_driver/metro_driver.h b/win8/metro_driver/metro_driver.h
deleted file mode 100644
index da8f1c61282a305958bd9c78cbc6595c3534142f..0000000000000000000000000000000000000000
--- a/win8/metro_driver/metro_driver.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2012 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 WIN8_METRO_DRIVER_METRO_DRIVER_H_
-#define WIN8_METRO_DRIVER_METRO_DRIVER_H_
-
-#include "stdafx.h"
-
-class ChromeAppViewFactory
-    : public mswr::RuntimeClass<winapp::Core::IFrameworkViewSource> {
- public:
-  ChromeAppViewFactory(winapp::Core::ICoreApplication* icore_app);
-  IFACEMETHOD(CreateView)(winapp::Core::IFrameworkView** view) override;
-};
-
-#endif  // WIN8_METRO_DRIVER_METRO_DRIVER_H_