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We will reuse it in WebAppInstallManager.

This is a cut-and-paste CL, no behavior change.

Bug: 875698
Change-Id: If126780727852bb0ce53979b027a01b1c00b58bc
Reviewed-on: https://chromium-review.googlesource.com/c/1314016Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605232}