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In trying to port Zucchini to build elsewhere a -Wshadow error occurred
this is a fix for that.

Change-Id: I8534756e8ee675704e7468bf5512b4e45ec599de
Reviewed-on: https://chromium-review.googlesource.com/967110Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@google.com>
Cr-Commit-Position: refs/heads/master@{#543816}