Use MeasureAs and ImplementedAs in media IDL

Source/core/html/HTMLVideoElement.h

Index: Source/core/html/HTMLVideoElement.h
diff --git a/Source/core/html/HTMLVideoElement.h b/Source/core/html/HTMLVideoElement.h
index d2a7732304173f858a5880ee5bbba0d00153ba8d..f83915205cefc16dd3e73bbadc92d195aafa08d0 100644
--- a/Source/core/html/HTMLVideoElement.h
+++ b/Source/core/html/HTMLVideoElement.h
@@ -27,7 +27,6 @@
 #define HTMLVideoElement_h
 
 #include "core/html/HTMLMediaElement.h"
-#include "core/page/UseCounter.h"
 
 namespace WebCore {
 
@@ -46,18 +45,11 @@ public:
     unsigned videoHeight() const;
 
     // Fullscreen
-    void webkitEnterFullscreen(ExceptionState&, UseCounter::Feature);
-    void webkitExitFullscreen(UseCounter::Feature);
-    void webkitEnterFullscreen(ExceptionState& es) { webkitEnterFullscreen(es, UseCounter::PrefixedVideoEnterFullscreen); }
-    void webkitExitFullscreen() { webkitExitFullscreen(UseCounter::PrefixedVideoExitFullscreen); }
+    void webkitEnterFullscreen(ExceptionState&);
+    void webkitExitFullscreen();
     bool webkitSupportsFullscreen();
     bool webkitDisplayingFullscreen();
 
-    // FIXME: Maintain "FullScreen" capitalization scheme for backwards compatibility.
-    // https://bugs.webkit.org/show_bug.cgi?id=36081
-    void webkitEnterFullScreen(ExceptionState& es) { webkitEnterFullscreen(es, UseCounter::PrefixedVideoEnterFullScreen); }
-    void webkitExitFullScreen() { webkitExitFullscreen(UseCounter::PrefixedVideoExitFullScreen); }
-
     // Statistics
     unsigned webkitDecodedFrameCount() const;
     unsigned webkitDroppedFrameCount() const;