GitLab

Record the number of loaded profiles when a profile is erased from the profiles map kept by profile manager.

The reason behind is, UMA is observing a significant amount of times when GetLoadedProfiles returns an empty list (multiple times during one session). We hope that recording such a histogram would help to find out the reason for it, or at least eliminate one possibility.

BUG=412794

Review URL: https://codereview.chromium.org/605333002

Cr-Commit-Position: refs/heads/master@{#297204}