StyleAdjuster.cpp: fix has no member named isMediaElement

https://bugs.webkit.org/show_bug.cgi?id=262106

Reviewed by Michael Catanzaro.

The Element class only adds the isMediaElement function if ENABLE(VIDEO).

Signed-off-by: Thomas Devoogdt <thomas.devoogdt@barco.com>
Canonical link: https://commits.webkit.org/266719.68@bugfix/StyleAdjuster-2.42.0

Source/WebCore/style/StyleAdjuster.cpp

@@ -170,8 +170,12 @@ static bool shouldInheritTextDecorationsInEffect(const RenderStyle& style, const
     auto isAtMediaUAShadowBoundary = [&] {
         if (!element)
             return false;
+#if ENABLE(VIDEO)
         auto* parentNode = element->parentNode();
         return parentNode && parentNode->isUserAgentShadowRoot() && parentNode->parentOrShadowHostElement()->isMediaElement();
+#else
+        return false;
+#endif
     }();
 
     // Outermost <svg> roots are considered to be atomic inline-level.