Don't use webmediaplayer to FullscreenController about fullscreen change

webkit/common/webpreferences.h

Index: webkit/common/webpreferences.h
diff --git a/webkit/common/webpreferences.h b/webkit/common/webpreferences.h
index f5dc458d5cc053aeca0535f56b12d3e7a0dbff70..8b4c9ed9a3bda708242378a90747b74319c6e30c 100644
--- a/webkit/common/webpreferences.h
+++ b/webkit/common/webpreferences.h
@@ -166,6 +166,7 @@ struct WEBKIT_COMMON_EXPORT WebPreferences {
   float font_scale_factor;
   float device_scale_adjustment;
   bool force_enable_zoom;
+  bool disallow_fullscreen_for_non_media_elements;
   bool double_tap_to_zoom_enabled;
   bool user_gesture_required_for_media_playback;
   GURL default_video_poster_url;