Make Fullscreen::requestFullscreen and exitFullscreen static

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/vr/VRDisplay.h"
 
 #include "core/dom/DOMException.h"
 #include "core/dom/Fullscreen.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "modules/vr/NavigatorVR.h"
@@ skipping 152 matching lines @@
         return promise;
     }
 
     m_layer = layers[0];
 
     if (m_layer.source()) {
         if (!m_capabilities->hasExternalDisplay()) {
             // TODO: Need a proper VR compositor, but for the moment on mobile
             // we'll just make the canvas fullscreen so that VrShell can pick it
             // up through the standard (high latency) compositing path.
-            Fullscreen::from(m_layer.source()->document()).requestFullscreen(*m_layer.source(), Fullscreen::UnprefixedRequest);
+            Fullscreen::requestFullscreen(*m_layer.source(), Fullscreen::UnprefixedRequest);
 
             m_isPresenting = true;
 
             resolver->resolve();
 
             m_navigatorVR->fireVRDisplayPresentChange(this);
 
             // Check to see if the canvas is still the current fullscreen
             // element once per second.
             m_fullscreenCheckTimer.startRepeating(1.0, BLINK_FROM_HERE);
@@ skipping 118 matching lines @@
     visitor->trace(m_navigatorVR);
     visitor->trace(m_capabilities);
     visitor->trace(m_stageParameters);
     visitor->trace(m_eyeParametersLeft);
     visitor->trace(m_eyeParametersRight);
     visitor->trace(m_framePose);
     visitor->trace(m_layer);
 }
 
 } // namespace blink