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Put repeated code in its own method, and optimize the method.

Change-Id: I418ea40480626bfe56a547d64fe74b7019dd53c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585973Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654598}