Do not forward multi-view fields to backend on detach The patch fixes an unexposed bug in FramebufferGL which would pass an incorrect multi-view state to StateManagerGL on texture detachment. The bug is not exposed because upon a subsequent syncing step the correct state is queried and restored from the framebuffer state. BUG=angleproject:2062 TEST=angle_end2end_tests Change-Id: Ie0e783c53e87497b3673ef87ab9c53c3c04054a7 Reviewed-on: https://chromium-review.googlesource.com/636369 Commit-Queue: Martin Radev <mradev@nvidia.com> Reviewed-by: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Corentin Wallez <cwallez@chromium.org>