Update the WPT importer sheriff rotation URL.

This changes the WPT import script to use the URL
https://build.chromium.org/deprecated/chromium/all_rotations.js
for fetching sheriff rotations.

Bug: 792193
Change-Id: I64bc3396bc921cc7f1e0420f872881fb2b25ebac
Reviewed-on: https://chromium-review.googlesource.com/809616Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521877}

third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_importer.py

@@ -36,7 +36,7 @@ POLL_DELAY_SECONDS = 2 * 60
 TIMEOUT_SECONDS = 210 * 60
 
 # Sheriff calendar URL, used for getting the ecosystem infra sheriff to TBR.
-ROTATIONS_URL = 'http://chromium-build.appspot.com/p/chromium/all_rotations.js'
+ROTATIONS_URL = 'https://build.chromium.org/deprecated/chromium/all_rotations.js'
 
 _log = logging.getLogger(__file__)