[fetch-later] Update "Reserve deferred-fetch quota" implementation

This updates the [fetch-later][3] feature which is in OT. However, no
real prod impact as changes are gated behind a flag.

This CL updates the implementation of the [algorithm][1], which is the
`GetContainerDeferredFetchPolicyOnNavigation()` method:

- Move its call site into `FrameLoader::StartNavigation()` to match the
  [Step 22. in the new html spec PR][2]. As a result, now it needs to
  take additional arg `to_url` as the navigation just starts.
- Allow it to trigger `PermissionsPolicy::InheritedValueForFeature()`,
  which is necessary for its quota calculation.

[1]: https://whatpr.org/fetch/1647.html#reserve-deferred-fetch-quota
[2]: https://whatpr.org/html/10903/d1c086a...0e0afb3/browsing-the-web.html#beginning-navigation
[3]: https://developer.chrome.com/blog/fetch-later-api-origin-trial

Bug: 40276121
Change-Id: If5423428c3f4a059761bf6e89d788ad2130aaf67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6162375
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Ming-Ying Chung <mych@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1405954}