Remove redundant FBO query methods. Several query methods simply wrapped a NULL check with a default return value. Most of these safety checks were unnecessary. BUG=angle:660 Change-Id: I0ac6897f06be082c8efab8721920d1b51ba999ee Reviewed-on: https://chromium-review.googlesource.com/205606 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>