facebook/react — pull request #505 by syranide (2013-11-10 15:57:09+00:00)
Title: Normalize deltaX/Y for FireFox

FireFox reports deltaY in deltaMode ```DOM_DELTA_LINE```, where a line is 1/40th of a pixel (by FireFox's standards at least). This normalizes it to report in ```DOM_DELTA_PIXEL``` instead, which is consistent with every other browser.