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This CL fixes the missing Permissions Policy issue for XSLT document.
Previously, the XSLT navigation will commit a new document without
necessary header information in |DocumentLoader::response_|, resulting
permissions policy header not effective for XSLT documents.

This CL lets document loader copy the state of Permissions Policy
(Feature Policy) from previous document to solve this problem.

Bug: 1151954
Change-Id: I4e1591af65d9e93ad49850fb23f69426bf116dc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561144Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Charlie Hu <chenleihu@google.com>
Cr-Commit-Position: refs/heads/master@{#832008}