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Following some earlier Onion Soup refactoring,
blink::PrivacyPreferences has no usage---only a couple scary
comments in renderer_preferences.mojom warning to keep fields "in sync"
with PrivacyPreferences.

This change deletes the dead PrivacyPreferences code and the scary
comments.

R=shimazu

Bug: 869748
Change-Id: If95f5da0fe40ec6507d34b8985b8c13f5685f3ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833707
Auto-Submit: David Van Cleve <davidvc@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702038}