GitLab

User Actions:
Suggestions.ScrolledAfterOpen
Suggestions.Card.SwipedAway

UMA:
ContentSuggestions.FetchPendingSpinner.VisibleDuration

Also add Guard against calls from Feed after destroy(), like
https://chromium-review.googlesource.com/c/chromium/src/+/1345422

Bug: 908706
Change-Id: Ifdd9dcab594d74eb79d0161d1ee66027a7adcea0
Reviewed-on: https://chromium-review.googlesource.com/c/1351932
Commit-Queue: Gang Wu <gangwu@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612306}