Low level answer, if you want to know the whole list:
This is stored in an sqlite3 database in Google Chrome's userprofile folder, on Linux it's located in
~/.config/google-chrome/Default/Top Sites
You can use SQLite3 to have a look at it:
me@local~/.config/google-chrome/Default$ cp Top\ Sites ts.sqlite
me@local~/.config/google-chrome/Default$ sqlite3 ts.sqlite
...
sqlite> .schema
...
CREATE TABLE thumbnails (url LONGVARCHAR PRIMARY KEY,url_rank INTEGER ,...
sqlite> select url_rank,url from thumbnails order by url_rank;
0|https://android.stackexchange.com/
...
21|http://archive.org/
23|https://android.googlesource.com/
24|https://android.meta.stackexchange.com/
To answer your question:
You can delete or edit an entry using regular SQL commands, but be sure that Chrome is not running, i.e. the file is not opened (by Chrome). Also note that I did all actions on a copy because of that (was only looking).
[del]
while targeting/hovering that entry?reddit.com/r/gonewild
when i meantreddit.com/r/programming
. (note the extra g,n,e,w,l,d)