Remove browsing data when the user tries to delete a profile.
Also, nuke the directory immediately for unloaded, deleting profiles.
BUG=476306
TEST=Have 2 profiles. Load Chrome and delete the un-loaded profile. That profile should be immediately removed from the User Data Directory.
TEST=Open Chrome. Browse to some sites. Examine the History file in the profile's directory - those sites will show up. Delete the Profile. The history file will still be present, but the sites are no longer present.
Review URL: https://codereview.chromium.org/
1093653002
Cr-Commit-Position: refs/heads/master@{#326590}