CHANGE: On App Engine use urlfetch's default deadline if None is pass…

…ed (httplib2#10)

* On App Engine use urlfetch's default deadline if None is passed.

python2/httplib2/__init__.py

@@ -1103,7 +1103,7 @@ def fixed_fetch(url, payload=None, method="GET", headers={},
                         allow_truncated=False, follow_redirects=True,
                         deadline=None):
             if deadline is None:
-                deadline = socket.getdefaulttimeout() or 5
+                deadline = socket.getdefaulttimeout()
             return fetch(url, payload=payload, method=method, headers=headers,
                          allow_truncated=allow_truncated,
                          follow_redirects=follow_redirects, deadline=deadline,