Removing D3D-isms from gl::Texture

BUG=angle:688
Change-Id: I0cdc758000993f2d54240c69a84f5ae149306d9e
Reviewed-on: https://chromium-review.googlesource.com/209332
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Brandon Jones <bajones@chromium.org>
8 files changed