dEQP-GLES3 texture failures:

http://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20dEQP%20%28NVIDIA%29/builds/4510/steps/angle_deqp_gles3_tests/logs/stdio

dEQP-GLES3.functional.shaders.texture_functions.texture.isampler*
dEQP-GLES3.functional.shaders.texture_functions.texture.usampler*

BUG=angleproject:1244

This reverts commit 7a6a1ffe.

Change-Id: I0e25e7aed0e0d78015d5b8f5a7b9a81e0a5fca4e
Reviewed-on: https://chromium-review.googlesource.com/316641Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>