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Although this is only used by the new architecture, it is model code
built on top of BrowserCoordinator, which also lives in ios/chrome.

This CL also renames the test_helpers/ directory to test/ to match other
cases in ios/chrome.

Bug: none
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I9b731c0805b36feb9cbced4688cb9899ac129ca8
Reviewed-on: https://chromium-review.googlesource.com/648076
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521593}