Sync requestFullscreen() and exitFullscreen() algorithms with the spec

third_party/WebKit/Source/modules/vr/VRDisplay.cpp

Index: third_party/WebKit/Source/modules/vr/VRDisplay.cpp
diff --git a/third_party/WebKit/Source/modules/vr/VRDisplay.cpp b/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
index 44ccd0df018303662d46cf6674c742b50ed68085..c35e7f133671d7e0e39b8124b7fbd0ee82798014 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
@@ -702,7 +702,7 @@ void VRDisplay::onFullscreenCheck(TimerBase*) {
   // depend on the Fullscreen API to fake VR presentation, so this will
   // become unnessecary. Until that point, though, this seems preferable to
   // adding a bunch of notification plumbing to Fullscreen.
-  if (!Fullscreen::isCurrentFullScreenElement(*m_layer.source())) {
+  if (!Fullscreen::isFullscreenElement(*m_layer.source())) {
     // TODO(mthiesse): Due to asynchronous resizing, we might get kicked out of
     // fullscreen when changing display parameters upon entering WebVR. So one
     // time only, we reenter fullscreen after having left it; otherwise we exit