[video_player] Update for UIScene compatibility (#10676) Replaces the code that used the key window's root view controller with a call to the new registrar `viewController` method to get the actual Flutter content's view controller. Since code behind the view provider abstraction is by definition not unit testable (since that's the interface used to DI a replacement in tests), this changes the API surface so that it's a direct passthrough to the registrar method. This does add some additional ifdefing, but minor compile-time complexity is better than having additional logic behind the test injection abstraction. Fixes https://github.com/flutter/flutter/issues/174416 ## Pre-Review Checklist [^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.
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