win/gn: Make building chromoting.msi work in 32-bit official builds.

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/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/manifest.gni")
 import("//build/util/version.gni")
 import("//remoting/remoting_enable.gni")
 import("//remoting/remoting_locales.gni")
@@ skipping 1111 matching lines @@
                  "VERSION=$chrome_version_full",
                  "OFFICIAL_BUILD=$_official_build",
                ]
       }
     } else {
       group("remoting_me2me_host_archive") {
       }
     }
 
     if (is_win && is_chrome_branded) {
+      if (target_cpu == "x86") {
+        # The script uses "ia32" instead of "x86".
+        msi_script_arch = "ia32"
+      } else {
+        msi_script_arch = target_cpu
+      }
+
       # GYP version: remoting/remoting_host_win.gyp:remoting_host_installation
       action("remoting_host_installation") {
         deps = [
           "//remoting/host:remoting_me2me_host_archive",
         ]
         script = "../tools/zip2msi.py"
         outputs = [
           "$root_out_dir/chromoting.msi",
         ]
         args = [
           "--wix_path",
           rebase_path("//third_party/wix"),
           "--intermediate_dir",
           rebase_path("$root_gen_dir/installation", root_build_dir),
           "--target_arch",
-          "$target_cpu",
+          msi_script_arch,
           rebase_path("$root_out_dir/remoting-me2me-host-$current_os.zip",
                       root_build_dir),
           rebase_path(outputs[0], root_build_dir),
         ]
       }
     }
   }
 }