Pass implementation object to supplemental classes by reference

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index af7aa5b060a504e93f49a37886540d02375b6298..9f5f1b3a1e6642796a683cba62df41359982f48e 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -3457,7 +3457,7 @@ void HTMLMediaElement::enterFullscreen()
     WTF_LOG(Media, "HTMLMediaElement::enterFullscreen");
 
     if (document().settings() && document().settings()->fullScreenEnabled())
-        FullscreenElementStack::from(&document())->requestFullScreenForElement(this, 0, FullscreenElementStack::ExemptIFrameAllowFullScreenRequirement);
+        FullscreenElementStack::from(document()).requestFullScreenForElement(this, 0, FullscreenElementStack::ExemptIFrameAllowFullScreenRequirement);
 }
 
 void HTMLMediaElement::exitFullscreen()
@@ -3465,7 +3465,7 @@ void HTMLMediaElement::exitFullscreen()
     WTF_LOG(Media, "HTMLMediaElement::exitFullscreen");
 
     if (document().settings() && document().settings()->fullScreenEnabled() && isFullscreen())
-        FullscreenElementStack::from(&document())->webkitCancelFullScreen();
+        FullscreenElementStack::from(document()).webkitCancelFullScreen();
 }
 
 void HTMLMediaElement::didBecomeFullscreenElement()