Fix double delete in Framebuffer.cpp. Depth-stencil buffers were using the same pointer for both attachments, which was causing a double-delete in the Framebuffer destructor. BUG=angle:686 Change-Id: I8b263e5a084c33b495ce18ef2a2a810918ef6540 Reviewed-on: https://chromium-review.googlesource.com/205639 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>