Use MeasureAs and ImplementedAs in media IDL

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 bfe0cb59a18cb5a9c5297995d607311492f2feba..6bbaa55e159f88b6aba19211a46898769f8962ff 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -3547,7 +3547,6 @@ void HTMLMediaElement::setClosedCaptionsVisible(bool closedCaptionVisible)
 
 unsigned HTMLMediaElement::webkitAudioDecodedByteCount() const
 {
-    UseCounter::count(document(), UseCounter::PrefixedAudioDecodedByteCount);
     if (!m_player)
         return 0;
     return m_player->audioDecodedByteCount();
@@ -3555,7 +3554,6 @@ unsigned HTMLMediaElement::webkitAudioDecodedByteCount() const
 
 unsigned HTMLMediaElement::webkitVideoDecodedByteCount() const
 {
-    UseCounter::count(document(), UseCounter::PrefixedVideoDecodedByteCount);
     if (!m_player)
         return 0;
     return m_player->videoDecodedByteCount();