GitLab

ImageSanitizer now clears its callbacks when finished to prevent holding
on to other objects and causing memory leaks.

Bug: 800540
Change-Id: Ifcc4f403ee32df6819d906744c07a1f6bd0684ae
Reviewed-on: https://chromium-review.googlesource.com/887104
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531970}