Revert of Remove the allowfullscreen exemption for the video-specific fullscreen API

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 f66f59c4422ba466b0ee4f8c44bcdb3692db78c2..e78e631d106e9f765ceb364727108fa3e4fedde0 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -2782,7 +2782,7 @@ void HTMLMediaElement::mediaPlayerRequestFullscreen()
     // user interaction or when it is technically required to play the video.
     UserGestureIndicator gestureIndicator(DefinitelyProcessingNewUserGesture);
 
-    Fullscreen::from(document()).requestFullscreen(*this, Fullscreen::InternalVideoRequest);
+    enterFullscreen();
 }
 
 void HTMLMediaElement::mediaPlayerRequestSeek(double time)
@@ -3140,6 +3140,20 @@ bool HTMLMediaElement::isFullscreen() const
     return Fullscreen::isActiveFullScreenElement(*this);
 }
 
+void HTMLMediaElement::enterFullscreen()
+{
+    WTF_LOG(Media, "HTMLMediaElement::enterFullscreen(%p)", this);
+
+    Fullscreen::from(document()).requestFullscreen(*this, Fullscreen::PrefixedVideoRequest);
+}
+
+void HTMLMediaElement::exitFullscreen()
+{
+    WTF_LOG(Media, "HTMLMediaElement::exitFullscreen(%p)", this);
+
+    Fullscreen::from(document()).exitFullscreen();
+}
+
 void HTMLMediaElement::didBecomeFullscreenElement()
 {
     if (mediaControls())