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This makes the HttpAuthCache copying in SigninPartitionManager work
when the network service is enabled.

Bug: 838942
Change-Id: I679885ad0b9f8ca3fada00b777f5a955ba7b4d0f
Reviewed-on: https://chromium-review.googlesource.com/c/1368949
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615768}