Retire CSSValueImpl and pin the W3C value facade#4160
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CSSValueImpl is unreferenced since the computed-style cascade moved to internal types; delete it, together with the COUNTER_ERROR and RECT_ERROR message keys it was the last user of. Document the remaining W3C surface (the CssValues records and CSSStyleDeclarationImpl) as a permanent compatibility facade rather than a transitional bridge: IStylingEngine.getStyle and IThemeEngine.getStyle return W3C types and propertyHandler contributions receive values as W3C CSSValue, so this surface stays. Also drop the redundant CSSStyleDeclaration implements clause from CSSComputedStyleImpl.
After the parser and DOM-mirror rework only two of the 19 DOMExceptionImpl message keys were still referenced. Throw plain DOMException with the message inlined at the four remaining call sites and delete DOMExceptionImpl and its ExceptionResource bundle.
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With #4122 merged, nothing references CSSValueImpl anymore, so this deletes it along with the COUNTER_ERROR and RECT_ERROR message keys it was the last user of. The remaining W3C surface (the CssValues records and CSSStyleDeclarationImpl) is now documented as a permanent compatibility facade rather than a transitional bridge, since IStylingEngine.getStyle and IThemeEngine.getStyle return W3C types and propertyHandler contributions receive values as W3C CSSValue. A second commit drops the now-dead DOM exception message-key machinery (DOMExceptionImpl, ExceptionResource): only two of its 19 messages were still referenced, now inlined as plain DOMException throws at the four call sites. Net about 210 lines removed with no behavior change.
Part of #3980.