Remove direct references to hermetic mac toolchain.

tools/clang/scripts/update.py

Index: tools/clang/scripts/update.py
diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
index d3cf8e0c821485363658ed8c02ab75888dc24d95..e8601007e539957682424667e58bed7d76ebc5d8 100755
--- a/tools/clang/scripts/update.py
+++ b/tools/clang/scripts/update.py
@@ -167,14 +167,6 @@ def WriteStampFile(s, path=STAMP_FILE):
 
 def GetSvnRevision(svn_repo):
   """Returns current revision of the svn repo at svn_repo."""
-  if sys.platform == 'darwin':
-    # mac_files toolchain must be set for hermetic builds.
-    root = os.path.dirname(os.path.dirname(os.path.dirname(
-        os.path.dirname(__file__))))
-    sys.path.append(os.path.join(root, 'build'))
-    import mac_toolchain
-
-    mac_toolchain.SetToolchainEnvironment()
   svn_info = subprocess.check_output('svn info ' + svn_repo, shell=True)

[justincohen, 2016/10/13 20:34:22]

I wonder what changed -- this used to fail before with hermetic

[erikchen, 2016/10/13 20:42:48]

The only thing I can think of is that when this failed, it was failing on a
machine with neither CLT nor XCode. That's starting to look more and more like
an unrealistic condition for us to try to work around. We should assume that the
system already has at least a CLT install.

   m = re.search(r'Revision: (\d+)', svn_info)
   return m.group(1)