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No longer store scroll offsets for elements in the DOM. Instead consistently get and set these in layout's `ScrollTree`. This more consistently requires layout to run when querying scroll offsets, which ensures that they are up-to-date and properly bounded by scrollable overflow area. Testing: This causes several WPT tests to start passing, and one to start failing. In the case of `/shadow-dom/scroll-to-the-fragment-in-shadow-tree.html`, I believe the issue is that we don't properly handle scrolling and shadow DOM elements. Before, the faulty scrolling was hiding this issue. Signed-off-by: Martin Robinson <mrobinson@igalia.com>