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This method checks for 3 bytes of available data, but reads only 2 bytes.

Change-Id: I504e9ed6cda18907a3f74cd931ef97d910043df5
Reviewed-on: https://chromium-review.googlesource.com/1185019Reviewed-by: Rachel Blum <groby@chromium.org>
Commit-Queue: Rachel Blum <groby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585076}