Remove direct references to hermetic mac toolchain.

build/config/mac/sdk_info.py

 # 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 argparse
 import os
 import subprocess
 import sys
 
-sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
-import mac_toolchain
-
 # This script prints information about the build system, the operating
 # system and the iOS or Mac SDK (depending on the platform "iphonesimulator",
 # "iphoneos" or "macosx" generally).
 #
 # In the GYP build, this is done inside GYP itself based on the SDKROOT
 # variable.
 
 def FormatVersion(version):
   """Converts Xcode version to a format required for Info.plist."""
   version = version.replace('.', '')
@@ skipping 25 matching lines @@
   # TODO: unconditionally use --show-sdk-build-version once Xcode 7.2 or
   # higher is required to build Chrome for iOS or OS X.
   if xcode_version >= '0720':
     settings['sdk_build'] = subprocess.check_output([
         'xcrun', '-sdk', platform, '--show-sdk-build-version']).strip()
   else:
     settings['sdk_build'] = settings['sdk_version']
 
 
 if __name__ == '__main__':
-  if len(sys.argv) != 2:
+  parser = argparse.ArgumentParser()
+  parser.add_argument("--developer_dir", required=False)
+  args, unknownargs = parser.parse_known_args()
+  if args.developer_dir:
+    os.environ['DEVELOPER_DIR'] = args.developer_dir
+
+  if len(unknownargs) != 1:
     sys.stderr.write(
         'usage: %s [iphoneos|iphonesimulator|macosx]\n' %
         os.path.basename(sys.argv[0]))
     sys.exit(1)
 
-  # Try using the toolchain in mac_files.
-  mac_toolchain.SetToolchainEnvironment()
-
   settings = {}
   FillMachineOSBuild(settings)
   FillXcodeVersion(settings)
-  FillSDKPathAndVersion(settings, sys.argv[1], settings['xcode_version'])
+  FillSDKPathAndVersion(settings, unknownargs[0], settings['xcode_version'])
 
   for key in sorted(settings):
     print '%s="%s"' % (key, settings[key])