Revert "Move sampler validation to the GL layer." Probably causing failures in the dEQP-GLES2 GL back-end tests: dEQP-GLES2.functional.uniform_api.info_query.basic.sampler2D_both BUG=angleproject:1123 This reverts commit 6fa156b66da2090c98f1a044a948694c7ac83324. Change-Id: I3cc993c34aae4a108037ce81709b71d16ece814e Reviewed-on: https://chromium-review.googlesource.com/301580 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>