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This CL separates DocumentPolicyFeature enum from FeaturePolicyFeature
enum, which makes DocumentPolicy and FeaturePolicy independent to each
other. Previous test on document policy and feature policy coexist
is removed. Follow-up CL will replace all usage of migrated features,
i.e. font display and unoptimized-lossless-images so that current wpt
tests on document policy still pass.

Bug: 993790
Change-Id: I730b95efd013c25d97c2d24dd777e12b7b38bbb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028666
Commit-Queue: Charlie Hu <chenleihu@google.com>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741609}