[DIPS] ContentBrowserClient::GrantCookieAccessDueToHeuristic().

The Opener and Redirect Heuristics help mitigate breakage from third-
party cookie blocking. As part of moving them from //chrome to
//content, they need a way to permit cookie access when it otherwise
would be blocked. In //chrome, CookieSettings is used, but this is not
available in //content.

Add a GrantCookieAccessDueToHeuristic() method to ContentBrowserClient,
which ChromeContentBrowserClient implements in terms of CookieSettings.

Internally, CookieSettings takes URLs and creates
ContentSettingsPatterns that match the (usually schemeful) sites. To
make it clear what behavior is expected, we make this new method take
SchemefulSites instead of GURLs.

Currently, OpenerHeuristicTabHelper and OpenerHeuristicService are in
//chrome, but soon they will be moved to //content (this CL is the last
major blocker).

For context, see go/dips-move

Bug: 366146269
Change-Id: I85e5aa51615091eb3a563117f7dbe9f1171e95d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5866857
Reviewed-by: Anton Maliev <amaliev@chromium.org>
Commit-Queue: Anton Maliev <amaliev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1361378}