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This CL fixes two potential issues related to code generator's migration

- Do not access Notification.vibration if it is missing
- Check Notifivation.data is null or not


Bug: 839389, 107964
Change-Id: If2ecbb1339bf539d52f4dad196d8aff36a7e0b80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228015
Auto-Submit: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774922}