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Previously it uses strip_k_prefix = False in update script but
strip_k_prefix = True in the presubmit checker. This CL fixes
this bug.

Change-Id: Ibd710b55c1f21ee944840a7dec2996cd20ef87a2
Reviewed-on: https://chromium-review.googlesource.com/c/1331634
Commit-Queue: Luna Lu <loonybear@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607350}