Remove deadcode from SVGResourcesCache::clientStyleChanged

https://bugs.webkit.org/show_bug.cgi?id=253403

Reviewed by Nikolas Zimmermann.

Remove code that is never ran due to clientStyleChanged
only being called by SVG renderers which are only
associated with SVGElements, making the if statement
always false.

* Source/WebCore/rendering/svg/SVGResourcesCache.cpp:
(WebCore::SVGResourcesCache::clientStyleChanged):

Canonical link: https://commits.webkit.org/269518@main

Source/WebCore/rendering/svg/SVGResourcesCache.cpp

@@ -108,6 +108,8 @@ static inline bool rendererCanHaveResources(RenderObject& renderer)
 
 void SVGResourcesCache::clientStyleChanged(RenderElement& renderer, StyleDifference diff, const RenderStyle* oldStyle, const RenderStyle& newStyle)
 {
+    ASSERT(!renderer.element() || renderer.element()->isSVGElement());
+
     if (!renderer.parent())
         return;
 
@@ -165,9 +167,6 @@ void SVGResourcesCache::clientStyleChanged(RenderElement& renderer, StyleDiffere
     }
 
     RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);
-
-    if (renderer.element() && !renderer.element()->isSVGElement())
-        renderer.element()->invalidateStyle();
 }
 
 void SVGResourcesCache::clientWasAddedToTree(RenderObject& renderer)