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We have already landed the NVIDIA driver updates, so removing the temporary
workaround in chrome and the old token definitions in the header.

BUG=chrome-os-partner:58718
TEST=nyan_big boots to login
TBR=kbr@chromium.org

Review-Url: https://chromiumcodereview.appspot.com/2443703002
Cr-Commit-Position: refs/heads/master@{#426925}