Pass implementation object to supplemental classes by reference

Source/core/html/shadow/MediaControlElements.cpp

Index: Source/core/html/shadow/MediaControlElements.cpp
diff --git a/Source/core/html/shadow/MediaControlElements.cpp b/Source/core/html/shadow/MediaControlElements.cpp
index 2c1ad6ef3389ae6501f2b264beba25fe69594849..5d7fcfbcbd1b9d2e95c1e01e16ecdf050d057986 100644
--- a/Source/core/html/shadow/MediaControlElements.cpp
+++ b/Source/core/html/shadow/MediaControlElements.cpp
@@ -555,9 +555,9 @@ void MediaControlFullscreenButtonElement::defaultEventHandler(Event* event)
         // screen behavior.
         if (document().settings() && document().settings()->fullScreenEnabled()) {
             if (FullscreenElementStack::isActiveFullScreenElement(toParentMediaElement(this)))
-                FullscreenElementStack::from(&document())->webkitCancelFullScreen();
+                FullscreenElementStack::from(document()).webkitCancelFullScreen();
             else
-                FullscreenElementStack::from(&document())->requestFullScreenForElement(toParentMediaElement(this), 0, FullscreenElementStack::ExemptIFrameAllowFullScreenRequirement);
+                FullscreenElementStack::from(document()).requestFullScreenForElement(toParentMediaElement(this), 0, FullscreenElementStack::ExemptIFrameAllowFullScreenRequirement);
         } else
             mediaController()->enterFullscreen();
         event->setDefaultHandled();