Update Chomium's build files to work w/ latest GN binaries.

courgette/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("//testing/test.gni")
 
 static_library("courgette_lib") {
   sources = [
     "adjustment_method.cc",
     "adjustment_method_2.cc",
@@ skipping 40 matching lines @@
     "patcher_x86_32.h",
   ]
 
   deps = [
     "//base",
     "//third_party/lzma_sdk",
   ]
 }
 
 executable("courgette") {
-  if (is_win && cpu_arch == "x64") {
+  if (is_win && current_cpu == "x64") {
     # The build infrastructure needs courgette to be named courgette64.
     output_name = "courgette64"
   }
 
   sources = [
     "courgette_tool.cc",
   ]
 
   if (is_win) {
     ldflags = [ "/LARGEADDRESSAWARE" ]
@@ skipping 56 matching lines @@
     "encoded_program_fuzz_unittest.cc",
   ]
   deps = [
     ":courgette_lib",
     "//base",
     "//base:i18n",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }