Replace Element::isMediaElement() with isHTMLMediaElement

Source/core/dom/FullscreenElementStack.cpp

Index: Source/core/dom/FullscreenElementStack.cpp
diff --git a/Source/core/dom/FullscreenElementStack.cpp b/Source/core/dom/FullscreenElementStack.cpp
index 046d275e54b97e9bcad3b7e968d98e482da2e0be..fc56e7b843d258ffafc5a0d53d83aca09f634140 100644
--- a/Source/core/dom/FullscreenElementStack.cpp
+++ b/Source/core/dom/FullscreenElementStack.cpp
@@ -35,6 +35,7 @@
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
+#include "core/html/HTMLMediaElement.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/rendering/RenderFullScreen.h"
@@ -189,7 +190,7 @@ void FullscreenElementStack::requestFullScreenForElement(Element* element, unsig
         //   - an activation behavior is currently being processed whose click event was trusted, or
         //   - the event listener for a trusted click event is being handled.
         // FIXME: Does this need to null-check settings()?
-        if (!UserGestureIndicator::processingUserGesture() && (!element->isMediaElement() || document()->settings()->mediaFullscreenRequiresUserGesture()))
+        if (!UserGestureIndicator::processingUserGesture() && (!isHTMLMediaElement(*element) || document()->settings()->mediaFullscreenRequiresUserGesture()))
             break;
 
         // There is a previously-established user preference, security risk, or platform limitation.