Scrolls columns left by the specified number of columns.
Original signature is '- (void)scrollColumnsLeftBy:(NSInteger)shiftAmount'
Available in Mac OS X v10.0 and later.


- shiftAmount (NSInteger)
- The number of columns by which to scroll the browser.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)