Clarify fullscreenElement vs. currentFullScreenElement distinction

third_party/WebKit/Source/core/dom/DocumentFullscreen.cpp

Index: third_party/WebKit/Source/core/dom/DocumentFullscreen.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentFullscreen.cpp b/third_party/WebKit/Source/core/dom/DocumentFullscreen.cpp
index f19b4ee294878d01323fa90fe7223e9a1d97152f..01ca3f8a23fba4d4b895290fe8c5119416627d2d 100644
--- a/third_party/WebKit/Source/core/dom/DocumentFullscreen.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentFullscreen.cpp
@@ -36,9 +36,7 @@ bool DocumentFullscreen::fullscreenEnabled(Document& document)
 
 Element* DocumentFullscreen::fullscreenElement(Document& document)
 {
-    if (Fullscreen* fullscreen = Fullscreen::fromIfExists(document))
-        return fullscreen->fullscreenElement();
-    return 0;
+    return Fullscreen::fullscreenElementFrom(document);
 }
 
 void DocumentFullscreen::exitFullscreen(Document& document)
@@ -46,11 +44,9 @@ void DocumentFullscreen::exitFullscreen(Document& document)
     Fullscreen::from(document).exitFullscreen();
 }
 
-Element* DocumentFullscreen::webkitCurrentFullScreenElement(Document& document)
+Element* DocumentFullscreen::currentFullScreenElement(Document& document)
 {
-    if (Fullscreen* fullscreen = Fullscreen::fromIfExists(document))
-        return fullscreen->webkitCurrentFullScreenElement();
-    return 0;
+    return Fullscreen::currentFullScreenElementFrom(document);
 }
 
 } // namespace blink