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This CL integrates the iOS client with the new directory service. It
also deletes the HostListFetcher and makes HostListService store and
return the protobuf HostInfo.

Bug: 954594
Change-Id: Ia47d91ba5e7bc2d0fdbdb441c95694e75deab6f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602075
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658563}