Remove unrefed texture validation variables.
Remove unrefed texture validation variables.

These were causing unused variable warnings in Linux GCC builds.

BUG=angle:773

Change-Id: I860d425a1caef07a58f6ff1b6c113ad7b63283dc
Reviewed-on: https://chromium-review.googlesource.com/231856
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Kenneth Russell <1ebccd90c2bc76de65b6f830f2128a91ed69fdfb@chromium.org>

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