Fix a typo in stash_client.js
Fix a typo in stash_client.js

Amazingly enough, this still worked... yay for Javascript?

BUG=none

Review URL: https://codereview.chromium.org/1413553002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#354447}

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