Reduce absolute paths in generated ninja files

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/util/process_version.gni")
 import("//media/media_options.gni")
 import("//remoting/build/config/remoting_build.gni")
 
 group("all_tests") {
   testonly = true
@@ skipping 608 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",
-      rebase_path(branding_path),
+      rebase_path(branding_path, root_build_dir),
       "--template",
       "{{source}}",
       "--output",
       "remoting/{{source_name_part}}",
       "en",
     ]
   }
 
   action_foreach("remoting_infoplist_strings") {
     sources = [
       "installer/mac/uninstaller/remoting_uninstaller-InfoPlist.strings.jinja2",
       "it2me/remote_assistance_host-InfoPlist.strings.jinja2",
       "mac/me2me_preference_pane-InfoPlist.strings.jinja2",
       "remoting_me2me_host-InfoPlist.strings.jinja2",
       "setup/native_messaging_host-InfoPlist.strings.jinja2",
     ]
 
     script = "//remoting/tools/build/remoting_localize.py"
     args = [
              "--locale_dir",
              rebase_path(webapp_locale_dir, root_build_dir),
              "--variables",
-             rebase_path(branding_path),
+             rebase_path(branding_path, root_build_dir),
              "--template",
              "{{source}}",
              "--locale_output",
              rebase_path(
                  "$root_gen_dir/remoting/host/{{source_name_part}}/@{json_suffix}.lproj/InfoPlist.strings",
                  root_build_dir),
            ] + remoting_locales_with_underscores
 
     outputs = []
     foreach(locale, remoting_locales_with_underscores) {
@@ skipping 133 matching lines @@
     group("remoting_me2me_host_archive") {
       deps = [
         "//remoting/host/installer/mac:remoting_me2me_host_archive",
       ]
     }
   } else {
     group("remoting_me2me_host_archive") {
     }
   }
 }