Bug 1317999 - Remove TODO about supporting Windows because it works; r=me

MozReview-Commit-ID: 2V0Ej8yqON7

--HG--
extra : rebase_source : 6db874e3bc8491cd0d56af8e3518a3a5af23b875

testing/mozharness/mozharness/base/python.py

@@ -511,7 +511,6 @@ class PerfherderResourceOptionsMixin(ScriptMixin):
             # Try to load EC2 instance type from metadata file. This file
             # may not exist in many scenarios (including when inside a chroot).
             # So treat it as optional.
-            # TODO support Windows.
             try:
                 # This file should exist on Linux in EC2.
                 with open('/etc/instance_metadata.json', 'rb') as fh: