Extend ProfileReset feedback with a 'caller' field.

BUG=
TBR=estade@chromium.org

Review URL: https://codereview.chromium.org/25250003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226183 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226183