Remove Display::recreateSwapChains.

This method was unused and dead code.

BUG=angle:794

Change-Id: I1348f5ffc62ff57f3c6503c6842cc68bcbefb550
Reviewed-on: https://chromium-review.googlesource.com/231851
Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>