Simplify octal constants in Python code (e.g. 0o0700 -> 0o700).

third_party/upload.py

Index: third_party/upload.py
diff --git a/third_party/upload.py b/third_party/upload.py
index baeb214e8f19cf6a8d00f28bd02f76b3e9f2d363..261485a33ea6b154bca8085e9e949a4ec177aa22 100755
--- a/third_party/upload.py
+++ b/third_party/upload.py
@@ -528,10 +528,10 @@ class HttpRpcServer(AbstractRpcServer):
           pass
       else:
         # Create an empty cookie file with mode 600
-        fd = os.open(self.cookie_file, os.O_CREAT, 0o0600)
+        fd = os.open(self.cookie_file, os.O_CREAT, 0o600)
         os.close(fd)
       # Always chmod the cookie file
-      os.chmod(self.cookie_file, 0o0600)
+      os.chmod(self.cookie_file, 0o600)
     else:
       # Don't save cookies across runs of update.py.
       self.cookie_jar = cookielib.CookieJar()