Remove isLastNonWhitespaceCharCloseBrace regex

[dsherret]

The isLastNonWhitespaceCharCloseBrace regex in StatementsStructurePrinter is incredibly slow. When printing this library's declaration file, it spends 9% of its time executing this regex.

Edit: It actually doesn't make sense it's taking so much time... I may be misreading chrome's profiling tools (I'm used to using dotTrace for c#). It still would probably be better to do a non-regex solution for this.

Edit 2: On another run this regex only used 1% of the time. I guess I need to run the profiler multiple times to get a more accurate picture.