Bug 1615898 [wpt PR 21822] - Iterating over dictionary's items with s…

…ix library for PY2 & PY3 comp…, a=testonly

Automatic update from web-platform-tests
Iterating over dictionary's items with six library for PY2 & PY3 compatibility.

--

wpt-commits: ef72cc2212e324334032148aea9169edf2562ef5
wpt-pr: 21822

testing/web-platform/tests/tools/webdriver/webdriver/protocol.py

@@ -2,6 +2,8 @@
 
 import webdriver
 
+from six import iteritems
+
 
 """WebDriver wire protocol codecs."""
 
@@ -39,5 +41,5 @@ def object_hook(self, payload):
         elif isinstance(payload, dict) and webdriver.Window.identifier in payload:
             return webdriver.Window.from_json(payload, self.session)
         elif isinstance(payload, dict):
-            return {k: self.object_hook(v) for k, v in payload.iteritems()}
+            return {k: self.object_hook(v) for k, v in iteritems(payload)}
         return payload