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 241fde36a26bbb7b1b7ac50d45dee88719a21627..cd675f92ec1d90d22715e2f2f2eb5e7530760de0 100644
--- a/webkit/common/webpreferences.h
+++ b/webkit/common/webpreferences.h
@@ -165,6 +165,7 @@ 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;