Fix enable_cardboard/enable_cast for GN build of remoting/android.

remoting/android/BUILD.gn

 # Copyright 2015 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/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//remoting/android/client_java_tmpl.gni")
 import("//remoting/android/remoting_apk_tmpl.gni")
 import("//remoting/remoting_options.gni")
 import("//remoting/tools/build/remoting_localize.gni")
@@ skipping 52 matching lines @@
   deps = [
     "//remoting/webapp:credits",
   ]
 }
 
 remoting_localize("remoting_apk_manifest") {
   sources = [
     "java/AndroidManifest.xml.jinja2",
   ]
   locales = [ "en" ]
-  defines = [ "ENABLE_CARDBOARD=$enable_cardboard" ]
+  if (remoting_enable_cardboard) {
+    defines = [ "ENABLE_CARDBOARD=1" ]
+  } else {
+    defines = [ "ENABLE_CARDBOARD=0" ]
+  }
   variables = [ branding_path ]
   output = "$root_gen_dir/remoting/android/{{source_name_part}}"
 }
 
 android_resources("remoting_android_client_java_resources") {
   custom_package = "org.chromium.chromoting"
   resource_dirs = [ "java/res" ]
   generated_resource_dirs = [ _raw_resources_base_dir ]
   generated_resource_files =
       get_target_outputs(":remoting_android_raw_resources")
@@ skipping 49 matching lines @@
   apk_name = "ChromotingTest"
   apk_under_test = ":remoting_apk"
   DEPRECATED_java_in_dir = "javatests/src"
   deps = [
     ":remoting_android_client_java",
     ":remoting_test_apk_manifest",
     "//base:base_java",
     "//base:base_java_test_support",
   ]
 }