Pass implementation object to supplemental classes by reference

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 5652275a3af939fb12f2e102ca6561ec8355dc38..96c69416d03e9c0cc087226c2d2a014f09879eab 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -2840,12 +2840,12 @@ void Element::setFloatingPointAttribute(const QualifiedName& attributeName, doub
 
 void Element::webkitRequestFullscreen()
 {
-    FullscreenElementStack::from(&document())->requestFullScreenForElement(this, ALLOW_KEYBOARD_INPUT, FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
+    FullscreenElementStack::from(document()).requestFullScreenForElement(this, ALLOW_KEYBOARD_INPUT, FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
 }
 
 void Element::webkitRequestFullScreen(unsigned short flags)
 {
-    FullscreenElementStack::from(&document())->requestFullScreenForElement(this, (flags | LEGACY_MOZILLA_REQUEST), FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
+    FullscreenElementStack::from(document()).requestFullScreenForElement(this, (flags | LEGACY_MOZILLA_REQUEST), FullscreenElementStack::EnforceIFrameAllowFullScreenRequirement);
 }
 
 bool Element::containsFullScreenElement() const