GitLab

* Remove self-destroying objects in favor of simply binding callbacks
* Make SiteDataDeleteHelper not refouncted anymore
* Don't hold on to JNIEnv

Bug: 766752
Change-Id: Ib85bc88b7118100a4af730c88c86dca489d5d3ed
Reviewed-on: https://chromium-review.googlesource.com/725732Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510060}