gyp performance: Load detect_host_arch directly.

third_party/binutils/download.py

 #!/usr/bin/env python
 # 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.
 # vim: set ts=2 sw=2 et sts=2 ai:
 
 """Minimal tool to download binutils from Google storage.
 
 TODO(mithro): Replace with generic download_and_extract tool.
 """
 
 import os
 import platform
 import re
 import shutil
 import subprocess
 import sys
 
 
 BINUTILS_DIR = os.path.abspath(os.path.dirname(__file__))
 BINUTILS_FILE = 'binutils.tar.bz2'
 BINUTILS_TOOLS = ['bin/ld.gold', 'bin/objcopy', 'bin/objdump']
 BINUTILS_OUT = 'Release'
 
 DETECT_HOST_ARCH = os.path.abspath(os.path.join(
-    BINUTILS_DIR, '../../build/linux/detect_host_arch.py'))
+    BINUTILS_DIR, '../../build/detect_host_arch.py'))
 
 
 def ReadFile(filename):
   with file(filename, 'r') as f:
     return f.read().strip()
 
 
 def WriteFile(filename, content):
   assert not os.path.exists(filename)
   with file(filename, 'w') as f:
@@ skipping 72 matching lines @@
     if ret != 0:
       return ret
     # Fetch the x64 toolchain as well for official bots with 64-bit kernels.
     return FetchAndExtract('x64')
   print "Host architecture %s is not supported." % arch
   return 1
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))