Revert "Remove the HTMLVideoElement-specific prefixed fullscreen API"

LayoutTests/media/video-play-require-user-gesture-expected.txt

Index: LayoutTests/media/video-play-require-user-gesture-expected.txt
diff --git a/LayoutTests/media/video-play-require-user-gesture-expected.txt b/LayoutTests/media/video-play-require-user-gesture-expected.txt
index e278cbe0147c35e85162d44281e5caa8cd08863e..a5c821be665d64d9a4c39aaa5ceebadbfa68e059 100644
--- a/LayoutTests/media/video-play-require-user-gesture-expected.txt
+++ b/LayoutTests/media/video-play-require-user-gesture-expected.txt
@@ -1,9 +1,11 @@
-Test that video play() does not work unless a user clicked on the play button.
+CONSOLE WARNING: 'HTMLVideoElement.webkitEnterFullScreen()' is deprecated. Please use 'Element.requestFullscreen()' and 'Element.webkitRequestFullscreen()' instead.
+Test that video play(), pause() and webkitEnterFullScreen() should not work unless a user clicked on the play button.
 
 EVENT(canplaythrough)
 
 * No user gesture initiated
 RUN(video.play())
+TEST(video.webkitEnterFullScreen()) THROWS(DOMException.INVALID_STATE_ERR: Failed to execute 'webkitEnterFullScreen' on 'HTMLVideoElement': This element may only enter fullscreen mode in response to a user gesture ('click', for example).) OK
 EXPECTED (video.paused == 'true') OK
 
 * User gesture initiated
@@ -11,5 +13,6 @@ EVENT(playing)
 RUN(video.pause())
 EVENT(pause)
 EXPECTED (video.paused == 'true') OK
+RUN(video.webkitEnterFullScreen())
 END OF TEST