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Update the example to match the new recommended style (use backticks).

Change-Id: I635c1dc0fabf1581f04f11c4ac9a98fda6edebdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277079
Auto-Submit: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784163}