port c65ae4f1 (r26346).

   fix one spelling error introduced by this CL.

original commit message:
  Reland "Initial switch to Chromium-style CHECK_* and DCHECK_* macros.".

BUG=

Review URL: https://codereview.chromium.org/886833006

Cr-Commit-Position: refs/heads/master@{#26507}