Remove the deprecated getViewCSS() compatibility bridge

The bridge was added when computeStyle(Element, String) replaced the W3C
cascade accessor, so that the PDE CSS spy kept working while it still
called getViewCSS().getComputedStyle(...). The spy no longer calls it,
so its last known caller is gone.

The org.eclipse.e4.ui.css.core.engine package is not exported to any PDE
bundle, so nothing in the SDK referenced the method at compile time; the
spy reached it reflectively.

Author: vogella

bundles/org.eclipse.e4.ui.css.core/src/org/eclipse/e4/ui/css/core/engine/CSSEngine.java

@@ -27,8 +27,6 @@
 import org.w3c.dom.Element;
 import org.w3c.dom.css.CSSStyleDeclaration;
 import org.w3c.dom.css.CSSValue;
-import org.w3c.dom.css.ViewCSS;
-import org.w3c.dom.views.DocumentView;
 
 /**
  * CSS Engine interface used to parse style sheet and apply styles to something
@@ -191,25 +189,6 @@ public interface CSSEngine {
 	 */
 	CSSStyleDeclaration computeStyle(Element element, String pseudoElt);
 
-	/**
-	 * Binary-compatibility bridge for callers compiled against the removed
-	 * W3C cascade accessor; use {@link #computeStyle(Element, String)}.
-	 */
-	@Deprecated(forRemoval = true, since = "2026-06")
-	default ViewCSS getViewCSS() {
-		return new ViewCSS() {
-			@Override
-			public DocumentView getDocument() {
-				return null;
-			}
-
-			@Override
-			public CSSStyleDeclaration getComputedStyle(Element elt, String pseudoElt) {
-				return computeStyle(elt, pseudoElt);
-			}
-		};
-	}
-
 	/*--------------- w3c Element -----------------*/
 
 	/**