Revert of Remove remote tree host and some related input and metro_driver code

win8/delegate_execute/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/ui.gni")
 import("//chrome/version.gni")
 import("//testing/test.gni")
 
 executable("delegate_execute") {
@@ skipping 32 matching lines @@
   public_deps = [
     "//base",
     "//breakpad:breakpad_handler",
     "//chrome/common:constants",
     "//chrome/installer/util:with_no_strings",
     "//ui/base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
+  if (use_aura) {
+    public_deps += [ "//win8:metro_viewer_constants" ]
+  }
+
   if (is_chrome_branded) {
     public_deps += [ "//google_update" ]
   }
 }
 
 process_version("version_resources") {
   visibility = [ ":*" ]
   sources = [
     "delegate_execute_exe.ver",
   ]
   output = "$target_gen_dir/delegate_execute_exe.rc"
   template_file = chrome_version_rc_template
 }
 
 test("delegate_execute_unittests") {
   sources = [
     "delegate_execute_util_unittest.cc",
   ]
   deps = [
     ":lib",
     "//base/test:run_all_unittests",
     "//testing/gtest",
   ]
 }