Roll Chrome into Mojo.

build/toolchain/win/midl.gni

 # 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.
 
 assert(is_win)
 
 import("//build/config/win/visual_studio_version.gni")
 
 # This template defines a rule to invoke the MS IDL compiler.
 #
@@ skipping 64 matching lines @@
       dlldata_file,
       interface_identifier_file,
       proxy_file,
       "{{source}}",
       "/char",
       "signed",
       "/env",
       idl_target_platform,
       "/Oicf",
     ]
-
-    foreach(include, system_include_dirs) {
-      args += [
-        "/I",
-        include,
-      ]
-    }
   }
 
   source_set(target_name) {
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
 
     # We only compile the IID files from the IDL tool rather than all outputs.
     sources = process_file_template(invoker.sources,
                                     [ "$out_dir/$interface_identifier_file" ])
 
     deps = [
       ":$action_name",
     ]
   }
 }