Remove direct references to hermetic mac toolchain.

build/mac_toolchain.py

Index: build/mac_toolchain.py
diff --git a/build/mac_toolchain.py b/build/mac_toolchain.py
index 44ea7e6c1985a670d4854bb1943f89e08ec53f55..5728ab5e98f1253576a27b22c591a23f1652089b 100755
--- a/build/mac_toolchain.py
+++ b/build/mac_toolchain.py
@@ -39,19 +39,6 @@ STAMP_FILE = os.path.join(BASE_DIR, 'mac_files', 'toolchain_build_revision')
 TOOLCHAIN_URL = 'gs://chrome-mac-sdk/'
 
 
-def GetToolchainDirectory():
-  if sys.platform == 'darwin' and not UseLocalMacSDK():
-    return TOOLCHAIN_BUILD_DIR
-  else:
-    return None
-
-
-def SetToolchainEnvironment():
-  mac_toolchain_dir = GetToolchainDirectory()
-  if mac_toolchain_dir:
-    os.environ['DEVELOPER_DIR'] = mac_toolchain_dir
-
-
 def ReadStampFile():
   """Return the contents of the stamp file, or '' if it doesn't exist."""
   try:
@@ -151,7 +138,7 @@ def AcceptLicense():
     subprocess.check_call(['sudo', '/usr/bin/xcode-select', '-s', old_path])
 
 
-def UseLocalMacSDK():
+def _UseLocalMacSDK():
   force_pull = os.environ.has_key('FORCE_MAC_TOOLCHAIN')
 
   # Don't update the toolchain if there's already one installed outside of the
@@ -167,8 +154,7 @@ def main():
   if sys.platform != 'darwin':
     return 0
 
-  # TODO(justincohen): Add support for GN per crbug.com/570091
-  if UseLocalMacSDK():
+  if _UseLocalMacSDK():
     print 'Using local toolchain.'
     return 0