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According to Push API spec[1], while subscribing to a push service, applicationServerKey field in push should also accept a base64url encoded string.

[1]https://w3c.github.io/push-api/#idl-def-pushsubscriptionoptionsinit

Bug: 802280

Change-Id: I8b02e4e5259b6359aece4c42eb66e1ce00b2bab3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1597492Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Sertay Sener <sesener@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#664674}