Changing. resetNorth_ function from O(n) to O(1).
To reproduce this issue, open the developer console and execute:
map.getView().setRotation(5000000000);
Then click on the rotation button. Before the commit, it takes a few
seconds, after this commit it is instantaneous.
In addition, due to limited floating point precision, the previous code
calculates a different value from this one.
This is a follow up of commit 761aa0ea5c.
That commit removed ol.control.Control.bindMouseOutFocusOutBlur function,
but forgot to remove this piece of code here.
Denilson Figueiredo de Sá