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[clean up] Remove legacy files that related to unoptimized-images as feature policy

Previously, unoptimized-images is migrated from feature policy to
document policy in https://chromium-review.googlesource.com/c/chromium/src/+/2058702,
but there are still expectation files to feature-policy-unoptimized-*.
This CL cleans up those obsolete files.

Change-Id: I8dd65679f5aacc4a19497903c03beb2834a0d942
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2229014Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Charlie Hu <chenleihu@google.com>
Cr-Commit-Position: refs/heads/master@{#776197}