[Optimize][Radon] Remove RadonElement and fiber-for-radon diff legacy path #4368
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This change unifies RadonDiff on FiberElement and removes the legacy RadonElement-based DOM, DynamicCSS, and list implementations. Key changes: - Delete RadonElement, RadonListElement, their headers, tests, and GN targets; remove all `is_radon_element` / `is_fiber_element` branches in core DOM, container, and layout code. - Strip DynamicCSSStylesManager of RadonElement-specific behavior (inheritance tree, direction/font-size resolving, placeholder styles) and leave only shared helpers used in the remaining code paths. - Simplify ElementManager, StyleResolver, RadonNode, and RadonComponent to always operate on FiberElement for RadonDiff, removing dual Radon/Fiber style resolution, inheritance, and fixed-node handling. - Remove the `enable_fiber_element_for_radon_diff` feature flag and its usage in TemplateAssembler, TouchEventHandler, PageProxy, and related call sites; Radon + Fiber is now the only supported configuration. - Simplify devtool inspector and platform facade code to assume FiberElement-only trees (component lookup, slot inspection, CSS selection, box model computation). - Drop Radon-specific list container element wiring; list adapter and list container delegates now rely solely on the shared Fiber-based list implementation. - Clean up unused trace event constants and build dependencies that were only referenced by the removed RadonElement and dynamic CSS paths. AutoSubmit: true
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