Sort the registrations returned by getRegistrations() by registration ID.

[chromium-wpt-export-bot]

This patch makes the order of the registrations returned by
getRegistrations() be sorted by registration ID, which fixes the flaky
test of getregistrations.https.html. Related Github issue is in
w3c/ServiceWorker#1465

Bug: 925740
Change-Id: Iaa5716eec886232df61bd23487fbae5c63413e9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1984900
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Wei4 Wang <wei4.wang@intel.com>
Cr-Commit-Position: refs/heads/master@{#732749}

[wpt-pr-bot]

The review process for this patch is being conducted in the Chromium project.

[stephenmcgruer]

Failed the stability check on chrome-dev:

 0:26.96 INFO |                              Test                             |                     Subtest                     |          Results           |                                                                                                                                                                                                                        Messages                                                                                                                                                                                                                       |
 0:26.96 INFO |---------------------------------------------------------------|-------------------------------------------------|----------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 0:26.96 INFO | `/service-workers/service-worker/getregistrations.https.html` | `Register multiple times then getRegistrations` | **FAIL: 1/10, PASS: 9/10** | `assert_array_equals: expected property 0 to be object "[object ServiceWorkerRegistration]" but got object "[object ServiceWorkerRegistration]" (expected array [object "[object ServiceWorkerRegistration]", object "[object ServiceWorkerRegistration]", object "[object ServiceWorkerRegistration]"] got [object "[object ServiceWorkerRegistration]", object "[object ServiceWorkerRegistration]", object "[object ServiceWorkerRegistration]"])` |
 0:26.96 INFO 

Unable to reproduce locally however, so let's try re-running.

[stephenmcgruer]

Failed again, and I was able to reproduce locally now as well. Will open a Chromium bug, but cc @makotoshimazu as an FYI

[stephenmcgruer]

Filed https://bugs.chromium.org/p/chromium/issues/detail?id=1043645, admin-merging this.