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This was previously used to cache the effect of the
"download-without-user-activation" policy, but since the removal of
FeaturePolicyForSandbox, it is no longer read anywhere, so this is all dead code.

Change-Id: I9eb574d447cabcfa7d9499366aa498bc9c7985c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575100
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Charlie Hu <chenleihu@google.com>
Cr-Commit-Position: refs/heads/master@{#834704}