Remove remote tree host and some related input and metro_driver code

win8/viewer/metro_viewer_constants.h

Index: win8/viewer/metro_viewer_constants.h
diff --git a/win8/viewer/metro_viewer_constants.h b/win8/viewer/metro_viewer_constants.h
deleted file mode 100644
index 560a4508d8116219ed1a949bab646cef97fa8788..0000000000000000000000000000000000000000
--- a/win8/viewer/metro_viewer_constants.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2013 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_VIEWER_METRO_VIEWER_CONSTANTS_H_
-#define WIN8_VIEWER_METRO_VIEWER_CONSTANTS_H_
-
-namespace win8 {
-
-// The name of the IPC channel between the browser process and the metro viewer
-// process.
-extern const char kMetroViewerIPCChannelName[];
-
-// Tells the viewer process to simply connect back without needing to launch a
-// browser process itself.
-extern const wchar_t kMetroViewerConnectVerb[];
-
-}  // namespace win8
-
-#endif  // WIN8_VIEWER_METRO_VIEWER_CONSTANTS_H_