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The following legacy policies are read by the manager:
  DelayDeliveryUntilVerdict
  BlockLargeFileTransfer
  AllowPasswordProtectedFiles
  BlockUnsupportedFiletypes
  kURLs* policies

The manager is not called by chrome code yet since the CL is already
quite large and to avoid having this reverted if subsequent code breaks
something.

Bug: 1062348
Change-Id: I4708a9a8a3bab8e559536b426bc4759705f48395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124856Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755502}