Unify mc.exe calling in GN, set environment.

remoting/host/BUILD.gn

 # Copyright 2014 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/allocator.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/util/version.gni")
 import("//remoting/remoting_host.gni")
 import("//remoting/remoting_locales.gni")
@@ skipping 318 matching lines @@
       "//testing/gtest",
     ]
 
     if (enable_configuration_policy) {
       deps += [ "//components/policy:policy_component_test_support" ]
     }
   }
 
   if (is_win) {
     import("//build/toolchain/win/midl.gni")
-    import("//remoting/tools/build/message_compiler.gni")
+    import("//build/win/message_compiler.gni")
 
     # TODO(brettw) these should not be generated via exec_script. This should be
     # part of the build process rather than the metabuild. Instead, a script
     # should generate a header containing the #defines for this as well as the
     # IDL file with the values.
     clsids = exec_script("win/get_clsids.py",
                          [
                            remoting_srcs_gypi_values.daemon_controller_guid,
                            remoting_srcs_gypi_values.rdp_desktop_session_guid,
                            version_full,
@@ skipping 304 matching lines @@
           "//remoting/resources",
           "//third_party/icu:icudata",
         ]
       }
     } else {
       group("remoting_me2me_host_archive") {
       }
     }
   }
 }