It is not perfect, but it works. You can use the following: I left it as a single line so you can easily copy it. Note: the output is ugly, but it works.
var i=500; while(i--){clearBreakpoint('/path/to/file/with/breakpoints.js', i); }
, , i= , , . . , , .
:
var i = 500;
while(i--){
clearBreakpoint('/path/to/file/with/breakpoints.js', i);
}