Out of 2,470 total delegates at the Republican National Convention in 2016, 437 are unpledged delegates, who play the same role as superdelegates. Of the 437, 168 are members of the Republican National Committee.
Romney might be able to be nominated from the floor, and the GOPe could still steal the nomination.
Romney might be able to be nominated on the convention floor and steal the nomination.
http://www.freerepublic.com/focus/f-news/3401400/posts?page=17#17
Only if Trump arrives at the convention with less than 1,237 pledged delegates. If Trump has that number or more, they cannot steal the nomination on the floor and their plot to install Romney or other GOPe hack as the nominee will not be possible.
On the first nominating ballot, all pledged delegates MUST vote for the person they are pledged to vote for. Only if no one has secured the votes of 1,237 delegates can the possibility that someone else other than Trump could ride in and steal the nomination. Pledged delegates are released from their pledge after the first ballot and are free to vote for whomever they wish in subsequent ballots until a nominee has secured 1,237 votes.
If Trump arrives at the convention with 1,237 pledged delegates (I predict he will have hundreds more than that), then Trump will win the GOP nomination on the first ballot, since the pledged delegates legally MUST vote for the person they are pledged.