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This change is pure refactoring. This is preparation for letting
RenderFrameHostImpl::MarkNotRestoredWithReason accept
CanStoreDocumentResult.

We'd like to pass not only multiple reasons and blocklisted
features but also disallowed reasons at
MarkNotRestoredWithReason.

As CanStoreDocumentResult is an inner class, forward
declaration is impossible, then this CL moves the class to
an independent file.

Bug: 1004676
Change-Id: I80a59f8035bc0093f87840b0b85ef7f6c31441d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877502
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712905}