Bug 1270317 - Use modern exception syntax in purgelong; r=jlund

MozReview-Commit-ID: ISd4b14mjkl

--HG--
extra : rebase_source : 55843bc02ddc47019addf9f47f55092f9fcbf6d0
extra : source : 85d4e575d0ca38fe3bfcee03b4e91a9d216d11ba

testing/mozharness/external_tools/purgelong.py

@@ -53,7 +53,7 @@ def unlink_wrapper(unlink_orig, fn, ui):
     try:
         ui.debug('calling unlink_orig %s\n' % fn)
         return unlink_orig(fn)
-    except WindowsError, e:
+    except WindowsError as e:
         # windows error 3 corresponds to ERROR_PATH_NOT_FOUND
         # only handle this case; re-raise the exception for other kinds of
         # failures