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To avoid too long filenames on Windows.

TBR=johnchen@chromium.org

Bug: 1014132
Change-Id: I062d56c0e75a34f6ce65ae4dffd84a7531e6716e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860499Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705585}