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This CL fixes the missing Document Policy issue for XSLT document.
The fix is similar to the previous fix on Permissions Policy.
See https://chromium-review.googlesource.com/c/chromium/src/+/2561144.

Bug: 1151954
Change-Id: Ie080c360ddc70ac46a63d5166b3830752ecdd94e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563440
Commit-Queue: Charlie Hu <chenleihu@google.com>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833361}