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Both IDBKey and PolicyValue Mojo unions where being wrapped with a
struct with the union as its only member. This CL simplifies that
representation by removing the outer struct.

Change-Id: I0fdfbdca7ae6553e48248e2a6a39a062120c6797
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2374449
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803452}