Removed the override of `window.requestAnimationFrame`
Removed the override of `window.requestAnimationFrame`

But kept it internally as `nextTick` function.

BBC-News/Imager.js,Brunosky75/Imager,tolis-e/Imager.js,icoee/Imager.js,vidyar/Imager.js,tolis-e/Imager.js,vidyar/Imager.js,Brunosky75/Imager,icoee/Imager.js,kendrick-k/Imager.js,drummerboof/Imager.js,hellopath/Imager.js,CondeNast/Imager.js,kendrick-k/Imager.js,hellopath/Imager.js,drummerboof/Imager.js,CondeNast/Imager.js