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Send the encryption key to network service so that the process
does not request the item from the keychain directly, which would
cause macOS to show a confirmation prompt.

Bug: 880522
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: Ia1067bf809472653d843b9007a45574bfe10ed2c
Reviewed-on: https://chromium-review.googlesource.com/1208457
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589343}