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This CL stores the certificate fingerprint from WebAppInfo in the
web_apps_to_apks dict to be used for digital asset link verification.
This is done to prevent the costly operation of converting the
fingerprint to a hash every time we need to verify the relationship.

Bug: 1026469
Change-Id: I33e2a40b46eac8da7ea865bd76523f43a3a218aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2198836
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768580}