remoting: fix out-of-tree build

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 737 matching lines @@
       outputs = [
         "$root_build_dir/remoting/{{source_name_part}}",
       ]
 
       args = [
         "--define",
         "ME2ME_HOST_PATH=$me2me_host_path",
         "--define",
         "IT2ME_HOST_PATH=$it2me_host_path",
         "--variables",
-        branding_path,
+        rebase_path(branding_path),
         "--template",
         "{{source}}",
         "--locale_output",
         "remoting/{{source_name_part}}",
         "en",
       ]
     }
 
     # TODO(crbug.com/512899) This still needs to be ported to GN.
     group("remoting_infoplist_strings") {
@@ skipping 375 matching lines @@
           "--target_arch",
           "$target_cpu",
           rebase_path("$root_out_dir/remoting-me2me-host-$current_os.zip",
                       root_build_dir),
           rebase_path(outputs[0], root_build_dir),
         ]
       }
     }
   }
 }